Malicious PDF — malware analysis report

Static analysis result for SHA-256 577014abed9f87a2…

MALICIOUS

PDF

94.9 KB Created: 2021-03-28 21:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: df42b569bb0001712b95ce89fa1da690 SHA-1: 41ae017492ea890514d3a3989a69c6a2aea66406 SHA-256: 577014abed9f87a2dd30eae089d8ef2fcb1371011fe3a3179c046392cbc7f228
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, identified as a link farm. Several heuristics indicate this is a malicious SEO-based link farm, likely intended to redirect users to phishing sites or download malware. ClamAV detection and ML classification further support its malicious nature. While no scripts were explicitly extracted, the nature of the link farm suggests it's designed to facilitate initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://maypoin.ru/award?keyword=filo+rotifera+pdf PDF link annotation
    • https://gugeropufil.weebly.com/uploads/1/3/0/8/130874104/95bb3e03df.pdfIn PDF document text
    • https://wigowuwadapol.weebly.com/uploads/1/3/5/3/135315864/bimitonero.pdfIn PDF document text
    • http://bcipreactivaperu.com/futaba_18sz_priceudx6l.pdfIn PDF document text
    • https://zukuvexoxowi.weebly.com/uploads/1/3/4/5/134597017/jolasibavinux.pdfIn PDF document text
    • http://axecheat1.xyz/rilifir93rc7.pdfIn PDF document text
    • http://kawasus.scienceontheweb.net/sasarowowaxaka.pdfIn PDF document text
    • http://hook-up.fun/can_you_be_late_for_your_walmart_grocery_pickup6dm5i.pdfIn PDF document text
    • https://tewamuwomipatus.weebly.com/uploads/1/3/0/9/130969874/6386918.pdfIn PDF document text
    • http://zonojebiridizo.mywebcommunity.org/vupenetika.pdfIn PDF document text
    • https://lupoxever.weebly.com/uploads/1/3/1/4/131413766/bopetuz.pdfIn PDF document text
    • https://faturigazed.weebly.com/uploads/1/3/4/8/134859690/c81e811d9edf03c.pdfIn PDF document text
    • https://bafalado.weebly.com/uploads/1/3/4/8/134865771/wivofuw_fexig_fobamefimexi_kewakukaz.pdfIn PDF document text
    • https://dapofawebowo.weebly.com/uploads/1/3/5/3/135347186/1087113.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rovefokizam.epizy.com/aeryon_skyranger.pdfIn PDF document text
    • http://luxetejafolakem.rf.gd/stewart_calculus_early_transcendentals_6th_edition_slader.pdfIn PDF document text
    • http://roxixelojoxas.rf.gd/what_are_the_three_general_types_of_audit_tests.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daed6b68-5bab-48c4-92c1-44dc64a2b1d3/giriw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b421c83-99e1-4e30-abef-bc7c9f23dc96/how_to_connect_a_samsung_top_loader_washing_machine.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_off00013007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13007 4812 bytes
SHA-256: 81ce1ec940dcce3c701287b6a06b0c3821ae14a19012ce4638b349c3824b5cf8
font_01_sfnt_off00014076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14076 14964 bytes
SHA-256: 1b632af3859d6bba145669e958afc25bddac252e698a165a0d080d41dcb6f288

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