Malicious PDF — malware analysis report

Static analysis result for SHA-256 f25c5a0af36d2337…

MALICIOUS

PDF

80.8 KB Created: 2021-05-01 23:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5425110468f20bbbc7b3bba8c8868ac9 SHA-1: b8599ea5afcbe9fc83eab40863a7cecf76c8c880 SHA-256: f25c5a0af36d2337cfae8bcbe50d9dd9a2309a4d727d0018e786d9334db92aec
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm designed to drive traffic to various websites. The ClamAV detection and ML classifier also indicate malicious intent, likely phishing or SEO spam. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://dugedepap.ru/strik?utm_term=peach+skin+color+code+cmyk PDF link annotation
    • http://saxobupazes.sportsontheweb.net/como_trabalhar_no_consulado_brasileiro_nos_estados_unidos.pdfIn PDF document text
    • http://wixosefimaba.scienceontheweb.net/audyt_bezpieczestwa_informacji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403807/normal_6014bbe74d06e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388428/normal_5fec92431e9bd.pdfIn PDF document text
    • https://famixarusefon.weebly.com/uploads/1/3/4/3/134396739/newisowab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486987/normal_60079d0c35be2.pdfIn PDF document text
    • https://fafenerukore.weebly.com/uploads/1/3/1/3/131398145/nujoraxig_ruvifob.pdfIn PDF document text
    • https://xelegiri.weebly.com/uploads/1/3/4/4/134435730/gobulapaw-pawikawus.pdfIn PDF document text
    • https://surupipenip.weebly.com/uploads/1/3/1/8/131856971/1629250.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501231/normal_603aa0bccafd8.pdfIn PDF document text
    • https://zanixikowupu.weebly.com/uploads/1/3/1/4/131437740/piluvekem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453718/normal_5ff23fa0b23e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472764/normal_5fe227af6cd52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495387/normal_6048e4a97b25d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427811/normal_5fc7e7eda85d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403679/normal_60671635e4a42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369502/normal_602285ce79458.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/837b80bc-a23d-4599-962e-e102e84153ea/28109088527.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a73aed8-2c61-4ff9-af73-7dd6687132fb/mathematical_statistics_with_resampling_and_r_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b3a3695-4838-4d05-a949-03d29dba6391/nusoboxezufiteboxaja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e89ca812-2727-436f-a8a5-445c3762d4e7/33495886278.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8438807f-0bce-4ba0-97db-b18c2d869314/2560190406.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40b58582-8b7a-4cd8-8a76-0d78a0a1ccd0/the_shack_chesterfield_mo_63017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce63310f-5193-4a84-8608-03b088462ba5/dunkin_donuts_medium_iced_vanilla_latte_nutrition_facts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeabef63-69c1-4f57-a006-c246ba033784/fantastic_fan_rv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5379a704-bfff-45eb-970c-a7c13868663a/17519773309.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE41 5348 bytes
SHA-256: 4c907f6b47f780a720fdea97b2925cfd7f67c8d4d9f6ca858807ee3ac989f1ee
font_01_sfnt_off00011049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11049 10940 bytes
SHA-256: 4acd978de3802036bd41dec5d4fa18db79f67a0c15bece0bcc9d4254592a8fe1

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