Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81d4b2dd1f0aff8…

MALICIOUS

PDF

71.6 KB Created: 2020-12-30 13:18:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: cb1c86bef2feabf80dd68f06e4fca5f6 SHA-1: 89ea10ffd53985f030cdbeab1fce3014b16b0c4a SHA-256: a81d4b2dd1f0aff897c48ee42439e3842f26c344d07d8c09288b069cfec68f2f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm designed to manipulate search engine results or direct users to malicious content. The primary URL, 'https://trafftec.ru/strik?utm_term=metta+world+peace+twitter+video', appears to be a lure for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafftec.ru/strik?utm_term=metta+world+peace+twitter+video PDF link annotation
    • https://wodanosivowifig.weebly.com/uploads/1/3/4/5/134593279/besapemupan.pdfIn PDF document text
    • https://fiwaxajosikevi.weebly.com/uploads/1/3/4/8/134885015/2846ef.pdfIn PDF document text
    • https://rofuvawe.weebly.com/uploads/1/3/4/3/134363923/gexula-mimagakodiz-sexetiviz-raxawufofud.pdfIn PDF document text
    • https://bawujepal.weebly.com/uploads/1/3/4/5/134515469/fodajusenuvoriv-lenagu-dusefowam.pdfIn PDF document text
    • https://burufazifefep.weebly.com/uploads/1/3/4/5/134584298/ddf5aa561c246.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/dinigugaxej/bar_graph_ielts_with_answer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a681348-d874-476c-b64b-2cd9980c216b/69165699839.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fa8d7cb-2a27-4ba4-833e-d83aeb8f9c5c/dungeon_defense_invasion_of_heroes_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19dadf07-78e7-4829-976e-7b12aa34c129/excel_what_if_analysis_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46d765db-e54a-4a5d-8b0c-7abfbaf914e0/bopitonuzepex.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/clash_of_clans_cheat_apk_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6556eea4-5a88-4a62-b95b-41d036909aaf/22277241861.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/bluestacks_offline_installer_free_for_pc.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_off0000dcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCA 5048 bytes
SHA-256: b215ba9be5e3a4bfa293eb683d21b278e31c7cc8a010075cb74165884a15ee58
font_01_sfnt_off0000ee27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE27 10428 bytes
SHA-256: 5b85c26629928f59a6ebab27b9eb05de6444a73532ce865be6478afaec088c40

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