Malicious PDF — malware analysis report

Static analysis result for SHA-256 871fff6819e877fd…

MALICIOUS

PDF

68.8 KB Created: 2021-06-12 01:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ecc508b755374db14fb2982b9c91cab9 SHA-1: 51b1e09ace3d83ed71a462e15e509cadf53b7f5c SHA-256: 871fff6819e877fd51347d301d2602a3b06e328aaafde3ac388ec4ef69dbdf93
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, https://crewmak.ru/pbw?utm_term=nobody+gets+me+like+you+wallows+lyrics, is flagged as unknown reputation and is likely the primary malicious destination. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crewmak.ru/pbw?utm_term=nobody+gets+me+like+you+wallows+lyrics PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462727/normal_604fb1e9db0f2.pdfIn PDF document text
    • https://jupikojeba.weebly.com/uploads/1/3/0/9/130968920/gelezo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371786/normal_6063142fd0eb8.pdfIn PDF document text
    • https://jaserasozupog.weebly.com/uploads/1/3/1/4/131454215/64935d4ca0ac8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470543/normal_6009e80368250.pdfIn PDF document text
    • https://vusiwofadenu.weebly.com/uploads/1/3/4/2/134265349/6298541.pdfIn PDF document text
    • https://gebajujevaxudod.weebly.com/uploads/1/3/5/3/135398545/xexugosoko.pdfIn PDF document text
    • https://nugaruxiboxora.weebly.com/uploads/1/3/0/7/130738781/xawugik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418970/normal_5fe46784cb900.pdfIn PDF document text
    • https://jibukosixej.weebly.com/uploads/1/3/4/0/134018053/f01d35cf2c577.pdfIn PDF document text
    • https://tokikagusiwa.weebly.com/uploads/1/3/4/0/134096322/9454131.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/a944ec4b-3855-44f4-9b29-ef016165c05d/how_do_u_add_and_subtract_unlike_fractions.pdfIn PDF document text
    • http://poxanoralanu.pbworks.com/f/punchline_algebra_book_b_answer_key_quadratic_equations_and_functions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/865a014e-dd0b-4f9a-9879-0c5e02d5a1ed/96990877207.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f23e8ff4-2bba-408f-a9f3-4d7f5ed5d654/56817079058.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/w/file/fetch/144416727/ruwupixidupabifenaronipu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fd574bd-ed1b-46d1-b540-55cac36b399f/78932006935.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7415a28a-a402-4393-96f9-d1d807eb02b4/starfinder_video_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61c6adf3-e9a4-4d2d-a574-f22e47104ad3/27927254326.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca974810-8263-4fcc-813f-20e3277af0d6/sevutusovopedupapin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea2003a2-9dc0-4374-8287-843b900bcbc2/ninja_blender_lid_model_nj600.pdfIn PDF document text
    • http://lesotarizim.pbworks.com/w/file/fetch/145161084/how_to_make_a_mob_elevator.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_off0000cf82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF82 5628 bytes
SHA-256: eed71f33387ee3234cf89ea87fd87cac42ad0c41a232231e19a8d38133e03fa2
font_01_sfnt_off0000e2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B4 10176 bytes
SHA-256: c08d7157d6627a65df390a0d4ce6dbbb02501273273d1293582d19675c59868b