Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ebb29ad43dacdf…

MALICIOUS

PDF

81.1 KB Created: 2021-02-14 02:33:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 097bddec708282938e682025efdd1954 SHA-1: e4e3c8a58c06bce90ec9b48d8c54db99aa0d1e35 SHA-256: 36ebb29ad43dacdff2dd970f75b1d51d49366ce0650ecbc521175d73c1ffa960
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to other PDF files hosted on disposable domains and free hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute further malware or phishing content. While no scripts were explicitly extracted, the nature of the link farm and the embedded URLs suggest a potential for malicious content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://seumenha.ru/wix?keyword=protein+synthesis+worksheet+answers+biology+binder PDF link annotation
    • http://kiwufaninini.22web.org/regabozurewavabepurub.pdfIn PDF document text
    • https://felixitu.weebly.com/uploads/1/3/4/0/134012625/8414112.pdfIn PDF document text
    • https://topukutenikoxi.weebly.com/uploads/1/3/4/6/134668920/9120607.pdfIn PDF document text
    • https://danodukuwen.weebly.com/uploads/1/3/1/6/131637043/1725503.pdfIn PDF document text
    • https://jixinedoxe.weebly.com/uploads/1/3/1/3/131383771/8630092.pdfIn PDF document text
    • http://rapegutuxipik.22web.org/42643182885.pdfIn PDF document text
    • https://cdn.sqhk.co/bobavijiwoba/bxzejcM/zediroxabigexi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388041/normal_600279b3ada58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490127/normal_5fca72888b3a0.pdfIn PDF document text
    • https://cdn.sqhk.co/lebudawojafi/ogejige/animal_in_your_room_app.pdfIn PDF document text
    • http://bizelapeto.iblogger.org/cisco_packet_tracer_for_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451027/normal_5fdc196c18fb8.pdfIn PDF document text
    • https://gupapuna.weebly.com/uploads/1/3/4/7/134726568/majawawitikuwisebu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403418/normal_5fc9fe8b4888a.pdfIn PDF document text
    • https://rikelakejif.weebly.com/uploads/1/3/4/8/134885243/5430900.pdfIn PDF document text
    • http://zemimumaloger.iblogger.org/pimunejukot.pdfIn PDF document text
    • https://zeposonuvijuz.weebly.com/uploads/1/3/4/7/134702940/08eabc811d004.pdfIn PDF document text
    • http://wigomufeze.22web.org/13795384287.pdfIn PDF document text
    • https://gadebalemalun.weebly.com/uploads/1/3/4/4/134443756/widumiw-wosavovex.pdfIn PDF document text
    • https://lulegosepo.weebly.com/uploads/1/3/0/9/130969478/xifolugude_tukololegawise_renanusilojisid_xevejopipik.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://dafemekadur.epizy.com/61826829427.pdfIn PDF document text
    • http://zapofekeba.rf.gd/hostgator_wordpress_templates.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_off0000f25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25F 5272 bytes
SHA-256: e49f3f55c0fcee98cd69212b95716cd090d73f3dc60d9cb300e753bac5853a41
font_01_sfnt_off00010448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10448 10616 bytes
SHA-256: 2c3595e769ed48cc408a78280e58878cbdbd9b6913d562e2001b17ed75f5552c
font_02_sfnt_off00012874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12874 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378