Malicious PDF — malware analysis report

Static analysis result for SHA-256 974d8818fbd5af86…

MALICIOUS

PDF

77.6 KB Created: 2021-03-30 16:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 74d3c089db79e281ab1238d2ef207ea4 SHA-1: 2053b4aaea504b50958b584bdd4afa9f8411dc27 SHA-256: 974d8818fbd5af86af394726218fb243ac932f64eb6a086bdd8dcebc91b699d4
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, including one pointing to 'seumenha.ru', suggesting an attempt to redirect users to potentially harmful websites. The PDF's structure and the presence of multiple external links indicate a likely SEO spam or phishing campaign, aiming to drive traffic to various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://seumenha.ru/strik?utm_term=what+is+the+new+burger+king+impossible+burger+made+of PDF link annotation
    • https://cdn.sqhk.co/vixawutozama/uFUghpi/tauceti_technology_benchmark_apk_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372358/normal_601f6151a130b.pdfIn PDF document text
    • https://cdn.sqhk.co/nupepewomaxu/xjjJkQ0/suwodowoden.pdfIn PDF document text
    • https://sidilatadafexu.weebly.com/uploads/1/3/1/1/131164021/gavizuwexexerevoser.pdfIn PDF document text
    • https://ninozaji.weebly.com/uploads/1/3/4/6/134690112/651d3740e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422150/normal_60255b4fdc7bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377408/normal_6010f84c1634e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449618/normal_5fdd06b1cc9f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479439/normal_603b1406bddcb.pdfIn PDF document text
    • https://romugazasemagop.weebly.com/uploads/1/3/4/8/134897733/gusoredakoluwa.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/d8d7a5b1-42fc-4fa9-92d6-79753504f5e2/what_is_the_average_density_of_the_earth_in_kg_m3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a049cf21-a789-46d1-bdd9-b523ce8f02d6/cub_cadet_ltx_1045_mower_deck_diagram.pdfIn PDF document text
    • https://9e6c4f0b-3406-4274-bf8a-5be7f948d240.filesusr.com/ugd/45c6ff_34cc57ed3e4d47c6afc78dcf310a7860.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/efbb392b-b1ea-469a-8907-cb5ebe284a0b/elements_of_drama_films.pdfIn PDF document text
    • https://75e6d08a-b14f-4c2c-bd4e-3e6431d9d11c.filesusr.com/ugd/497a87_6f0113a3eec8476fa7f54881bb601fc0.pdf?index=trueIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_bbd7fabe966f43d8ab922c2619ed0199.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/03089216-46db-4f99-8b6b-9ee0d1780e3c/christmas_real_book_free.pdfIn PDF document text
    • https://b0837e58-6fb0-4b2c-a83d-c451c4d85cc2.filesusr.com/ugd/1169b1_34c39537abee4bf7b090b08557a6e817.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f702351-d102-443b-b89d-195483449329/how_to_install_keurig_water_line.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c17e985-a441-486e-9254-ad933f149d15/talujatovekisorajorun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/610ea3b3-5eae-42e4-b36f-0da10fa97c28/who_does_mia_marry_in_princess_diaries_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72f7bd99-3ece-47c5-99a9-24af9d0ea757/free_printable_math_worksheets_2nd_grade_fractions.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35F 5648 bytes
SHA-256: 27196beb7f55d4418322378595f7af029d3491020cde3aecebb2ded176d69bae
font_01_sfnt_off0000f66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66A 10736 bytes
SHA-256: 96fa79e2b55901bab2067666318574ff7e424e60007c4710334b091689505a23
font_02_sfnt_off00011b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B31 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34