Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9131beee5c5d26d…

MALICIOUS

PDF

73.2 KB Created: 2021-06-08 16:39:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a70a12fe7340e1fa045011c8fef0a0b1 SHA-1: 6926f604a099925636bc00286e455752b68184be SHA-256: f9131beee5c5d26dceb2d652cd7fcf528e4e23a85dfd2b4e660b397642c9a6fc
186 Risk Score

Malware Insights

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

This PDF file is classified as malicious by ML and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation designed to redirect users. The document body contains a deceptive lure related to pawn shops, likely intended to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://smidgel.ru/pbw?utm_term=the+nearest+pawn+shop+from+my+location+%253B+50+%253B+2.38+%253B+6.75+%253B+Low+%253B+13 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4497666/normal_601fd7a1cf8ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500911/normal_6006bdead6694.pdfIn PDF document text
    • https://palatixediwiwi.weebly.com/uploads/1/3/4/6/134626211/nofisifajuzewamor.pdfIn PDF document text
    • https://wuwejinetuna.weebly.com/uploads/1/3/2/6/132681176/702857df6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454047/normal_6033cc062e424.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457848/normal_60bdb260eec4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459323/normal_602631c617cba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374177/normal_60033666c88f9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zowonixepor.pbworks.com/f/eternal_sunshine_of_the_spotless_mind_story_explained.pdfIn PDF document text
    • http://sirazumebow.pbworks.com/w/file/fetch/144545163/behavioral_interview_questions_and_answers_for_data_analyst.pdfIn PDF document text
    • http://nigezid.pbworks.com/w/file/fetch/144574617/bakolisusakizenobovorej.pdfIn PDF document text
    • http://sepaxebi.pbworks.com/w/file/fetch/144419151/wewomiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc1452f2-52b7-4864-8daf-2a13fbae1ace/sijiluxodatajot.pdfIn PDF document text
    • http://tukufidanega.pbworks.com/w/file/fetch/144628038/gavikinixunipubi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53a94586-a05e-4745-9847-426a4d2b0817/how_to_learn_basic_excel_skills.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/772bf9be-1b86-4e9c-b845-2685c378f1a0/25528539168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c785bfa-d8cd-4f80-97ce-67ab11596329/what_was_the_us_role_in_world_war_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e2aaff4-7cbb-4354-b379-aa23f3df16f7/plantronics_backbeat_fit_reset_bluetooth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac6dbe7b-3c3b-4590-84bc-8f7713405110/loreena_mckennitt_the_book_of_secrets_dvd.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_off0000dd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6C 6580 bytes
SHA-256: 54cbbea541c15c4e64d5ff7d98b2ecaf8be63f803894927873ee0bd1af11b7b2
font_01_sfnt_off0000f3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DA 10272 bytes
SHA-256: 00ac93ad4e32eb96059ff2e846946fea2fae72cea5145ae8d8a5d1c06092d638