Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e625233af1165e6…

MALICIOUS

PDF

80.7 KB Created: 2021-01-09 22:49:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 49ff0717320c874df9ed246a59cb3f2b SHA-1: bd4c073318716f947d1a90baae8471ba8872f206 SHA-256: 9e625233af1165e62968104d359a409bd4a7132b82c22ec14ef15b7dd28287c5
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is used to host and redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/aws?utm_term=acta+constitutiva+de+una+sociedad+anonima+formato PDF link annotation
    • https://site-1172728.mozfiles.com/files/1172728/robotics_notes_anime_episode_list.pdfIn PDF document text
    • https://woliremokeg.weebly.com/uploads/1/3/4/3/134340334/b48617a8.pdfIn PDF document text
    • https://cdn.sqhk.co/wopidaxiwuk/ieojihg/mr_guns_and_gear_shirts.pdfIn PDF document text
    • https://site-1168339.mozfiles.com/files/1168339/freestyle_extreme_bristol.pdfIn PDF document text
    • https://cdn.sqhk.co/migixurej/hcjchii/jazz_super_duper_offer_monthly_1000.pdfIn PDF document text
    • https://cdn.sqhk.co/nezusoxe/iIhdjim/ximipubegibefotefevogogo.pdfIn PDF document text
    • https://site-1201176.mozfiles.com/files/1201176/gba_emulator_android_mod_apk.pdfIn PDF document text
    • https://site-1171599.mozfiles.com/files/1171599/zegup.pdfIn PDF document text
    • https://cdn.sqhk.co/wazewiput/mjfsiic/hidden_messages_synonym.pdfIn PDF document text
    • https://site-1177603.mozfiles.com/files/1177603/hola_music_ukulele_strap.pdfIn PDF document text
    • https://cdn.sqhk.co/rogapakaler/Gjejhov/siwajasofizidiwozeje.pdfIn PDF document text
    • https://cdn.sqhk.co/wodaximewule/iCzQge1/wepujav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/agents_of_shield_season_1_reddit.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_off0000fbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC7 5184 bytes
SHA-256: d1ce43b47c70e1d9b6b88cb621d170a90434d7b079168f26cf07ca1fe5e7840b
font_01_sfnt_off00010d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5C 12052 bytes
SHA-256: 21500e1b4501489cfdbc5f31a17af523ef94e3081efad12a9a320341e0d364db

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