Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac6a88c2c5d5e57b…

MALICIOUS

PDF

79.0 KB Created: 2021-03-31 23:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c943a7884d4f43215d3fccde989d3f2c SHA-1: 514b1204c29bcc2a79aea08476658238b5adfa7e SHA-256: ac6a88c2c5d5e57b5e3a3663b96f5fdfaf8c0a89d35dce92c183dd7b72689a96
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting and flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to contain keywords related to educational materials, suggesting a lure to disguise the malicious intent of redirecting users to the external URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://maypoin.ru/wix?keyword=holt+physical+science+textbook+9th+grade PDF link annotation
    • http://netarowivon.iblogger.org/uc_browser_software_for_desktop.pdfIn PDF document text
    • http://virivuluk.getenjoyment.net/an_introduction_to_algebraic_structures_landin.pdfIn PDF document text
    • http://fevofawemuwa.medianewsonline.com/rofalalikawavojodivu.pdfIn PDF document text
    • http://jotipire.iblogger.org/adhyatma_ramayanam_malayalam_with_meaning.pdfIn PDF document text
    • http://mavafesumej.medianewsonline.com/nogikapegek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://680e7e7f-99bb-4309-8a01-ecc910dc7690.filesusr.com/ugd/717a42_3f93fac35b4f44ba99ecc274ecb642e0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fopalew/71288709987.pdfIn PDF document text
    • http://zowiseli.epizy.com/whatsapp_for_laptop_windows_10_pro.pdfIn PDF document text
    • http://giwofigu.epizy.com/39057988087.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/60052695786.pdfIn PDF document text
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_98531452099948389feaa7c05abde829.pdf?index=trueIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_4c912e311996457e9fbde26d97e56b79.pdf?index=trueIn PDF document text
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_8e20d1b50d124934aa3f6e3f4c82fcdf.pdf?index=trueIn PDF document text
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_5ffdff9b27594e67b2b9a56ef85ff3b4.pdf?index=trueIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_d92371f4e9ca4dff98ed1a9e6834e1dc.pdf?index=trueIn PDF document text
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_22803298ef2d44b6aa4feedf1c81ce33.pdf?index=trueIn PDF document text
    • https://db22a0a0-c6c8-4eb9-9878-037c50d93224.filesusr.com/ugd/e2b5b3_2c78557d663846c0a1f3cd4f297e6e97.pdf?index=trueIn PDF document text
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_7e71dc978c1544989d0e7eb9acc94afe.pdf?index=trueIn PDF document text
    • http://gurepabe.epizy.com/how_to_make_money_flipping_houses_australia.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_off0000f5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E6 5828 bytes
SHA-256: 544b4d78cee34bce9167afd0d14f7cf6a6e0f5d596895ab916551a30e94dc44f
font_01_sfnt_off000109b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B2 10860 bytes
SHA-256: cfc2e9c377f95c4e864b5264fafb671962ceaa413eddb87246c7a6605c932baf

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