Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed4b268201f94056…

MALICIOUS

PDF

109.0 KB Created: 2021-06-06 19:40:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1fbad2313704fd0dbb7270bf46a73a9b SHA-1: e28b21d02b22db0ccc1f449263040da9d4536bcf SHA-256: ed4b268201f9405676b2ef032149bd3e078a7ec734ae84b1ec9c7b05ab10ec33
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://oniceh.ru/pbw?utm_term=what+is+the+purpose+of+the+employment+equity+act PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485012/normal_603261408a680.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4376609/normal_60affebb014b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454668/normal_602e3aa4b3fab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459477/normal_6032c0caa1c0b.pdfIn PDF document text
    • https://rozutawupev.weebly.com/uploads/1/3/2/6/132695629/166fe8bcd023ed3.pdfIn PDF document text
    • https://dumiwezabofovo.weebly.com/uploads/1/3/4/7/134743005/8283070.pdfIn PDF document text
    • https://dozumudokasalog.weebly.com/uploads/1/3/4/9/134902229/wekozugop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454171/normal_600ed82d7ee01.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bopelijexuf.pbworks.com/f/sewopasigenorupivuzif.pdfIn PDF document text
    • http://zivovot.pbworks.com/f/best_ou_team_pokemon_showdown_gen_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28f61e07-e6f2-4982-82a6-baa509f7141e/pipulokevisefolawemeb.pdfIn PDF document text
    • http://volikedejefa.pbworks.com/f/tavorijimesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9bad3c1-5b0c-4e66-a0cc-0da8c3a4e229/14927455949.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f8e1132-2939-4ffe-875e-7d91cb20f648/what_are_the_3_types_of_claims.pdfIn PDF document text
    • http://kipizasuzeda.pbworks.com/f/where_is_the_drain_pump_on_a_whirlpool_washing_machine.pdfIn PDF document text
    • http://zogekinovag.pbworks.com/f/legav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6835dd46-889e-429d-b184-e17b16b31f13/what_is_the_most_powerful_fighting_style.pdfIn PDF document text
    • http://gogoporiwo.pbworks.com/w/file/fetch/144663699/43361176979.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17162 5496 bytes
SHA-256: f34964147ec05949c867fe60562582160be3e8bc98e917e4957a25523368640b
font_01_sfnt_off00018404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18404 11536 bytes
SHA-256: 73b2e1b9f891eb0a061863ba125ebac98c3e022a7ddc2645b260e6a2c4df00a6