Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad1bfbdb0d298c1…

MALICIOUS

PDF

76.6 KB Created: 2021-06-07 23:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4b6fed9bd575a23f27c507e8bde9e570 SHA-1: 1b6eff1fd981b58f5f898c40ce0bbfe968d418e3 SHA-256: fad1bfbdb0d298c18fc5036c9dd82e20f4718b533924c76ba451d51066a4cedf
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9998

Heuristics 4

  • 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://nomylo.ru/pbw?utm_term=what+are+10+examples+of+compound+sentences PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385231/normal_606e0802be2b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453579/normal_603ded124d831.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502920/normal_60063c718904e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460708/normal_6055be1135f0a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378390/normal_5ffbfd553a53f.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4427268/normal_60b4a45149294.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
    • http://kimotamiju.pbworks.com/f/xaxunezipa.pdfIn PDF document text
    • http://javefanudosa.pbworks.com/f/how_to_pair_speaker_to_iphone.pdfIn PDF document text
    • http://paderukut.pbworks.com/f/gemad.pdfIn PDF document text
    • http://xuvabufoj.pbworks.com/w/file/fetch/144564225/guns_of_glory_asia_mod_apk_unlimited_money.pdfIn PDF document text
    • http://lekuzax.pbworks.com/f/83213213756.pdfIn PDF document text
    • http://nolumemonip.pbworks.com/w/file/fetch/144506124/spotify_premium_apk_ios_13.5.1.pdfIn PDF document text
    • http://wuwolufit.pbworks.com/f/how_to_reset_onn_earbuds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84710728-759f-4a5c-a3bc-2ef4d4242d9d/jojetagudabaxupoxivo.pdfIn PDF document text
    • http://jetubabup.pbworks.com/w/file/fetch/144784401/gudex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95c6afc3-adaa-4f81-b110-ee55421a07e2/how_to_adjust_ventilator_based_on_abg.pdfIn PDF document text
    • http://metudebebi.pbworks.com/w/file/fetch/144621678/explain_absolute_cost_advantage_in_economics.pdfIn PDF document text
    • http://funuvutidip.pbworks.com/f/21723647664.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_off0000e10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10E 5504 bytes
SHA-256: 945824006d04126fd1d671143bd1d209061e4cdecc7744d0a633ce04e6d89795
font_01_sfnt_off0000f3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B5 10264 bytes
SHA-256: 3783890fa38186296bb8d5c3678f31e5f73e6762f1214fe6fa9a503e2d9861ae
font_02_sfnt_off000116e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E7 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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