Malicious PDF — malware analysis report

Static analysis result for SHA-256 2278a6f0c7d847b0…

MALICIOUS

PDF

81.0 KB Created: 2021-03-27 11:05:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d37feecefc69462c4d053e3adc6a5276 SHA-1: b568fd2bbfe593dd66d851e391259371cbbcb491 SHA-256: 2278a6f0c7d847b0bee865e8ca939ba668e69876284e69b27b53b51886af6112
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a credential phishing lure impersonating UPS. It contains numerous external links, many pointing to disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The embedded links likely lead to a second-stage payload or a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://nupadosizekibu.weebly.com/uploads/1/3/4/5/134597568/wudexixaxinavazose.pdf.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://fokemale.ru/strik?utm_term=how+to+fix+bose+3+cd+changer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493600/normal_603b2a51774ad.pdfIn PDF document text
    • https://nupadosizekibu.weebly.com/uploads/1/3/4/5/134597568/wudexixaxinavazose.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456135/normal_6005e265d5bac.pdfIn PDF document text
    • https://lixubirenolona.weebly.com/uploads/1/3/4/6/134669397/padef-wizewi-takofomog.pdfIn PDF document text
    • https://mejotozoferu.weebly.com/uploads/1/3/4/8/134866749/8967821.pdfIn PDF document text
    • https://nitevafatuva.weebly.com/uploads/1/3/4/8/134872456/momokapow-xodevo-xevamag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403687/normal_603f1b1585c63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486363/normal_6044d4bf90431.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476274/normal_600980b9c8e49.pdfIn PDF document text
    • https://fuvobavan.weebly.com/uploads/1/3/1/6/131637325/ludosapirelaze_rirel_sazureperibu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d15e26be-85f3-4e58-a372-748799874f7a/89623742182.pdfIn PDF document text
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_1c497a29bf9547b8b21b3ecf91fb1341.pdf?index=trueIn PDF document text
    • https://2cfcb734-ec62-4cd9-b61c-03d4762ad765.filesusr.com/ugd/a891c0_45ecfefa28f342b5a36857d56ce3a4f5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/83544d37-50a8-4860-93a7-9cc858a87ba9/57366626755.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2689a72c-1de9-490b-aa97-11a279607310/robert_fagles_iliad_and_odyssey.pdfIn PDF document text
    • https://ac402fee-74f4-49a6-b5a4-6a03c6a057de.filesusr.com/ugd/b0cd75_fadf19aa3cad47e687caa76330b384fb.pdf?index=trueIn PDF document text
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_c074f9808ba14d89ac6ca2aadde6bd4e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a65da041-1b2a-4054-b87b-a4988aec3a8d/guitar_beginner_chord_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f88c693-2da9-4aca-a401-d0db678ab603/what_type_of_note_gets_4_beats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13e32b90-0c48-484e-af87-95f42d0b6b13/nosiwezukobazagibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aee93f41-0b8e-440b-9a78-37d9423f8079/film_directing_shot_by_shot_review.pdfIn PDF document text
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_68c6934ab50c4eeda1fb1661adaf1758.pdf?index=trueIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_621044f226bd48f1a8bc58ff80fe63ce.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED6 5464 bytes
SHA-256: 9f09b6efc6bc9ceccd0c698008ec07d7b650e0600e7ef0d01f0f57efe4ff0b00
font_01_sfnt_off00010166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10166 11316 bytes
SHA-256: 5816d3758e0c190be72866d099142a78af0115d4355d93d9f0c30462304e5d7a
font_02_sfnt_off00012824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12824 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34