Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a2f2603063948f…

MALICIOUS

PDF

103.7 KB Created: 2020-12-31 11:08:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ad109e6b07c0e345cd4f8257a3110ab4 SHA-1: 2965ffd3a9c69bcffbd3092f0ffc5108a4cc4818 SHA-256: 42a2f2603063948f8c2e16e899ca8f348ef6d7b5a3b2cb3c599d3e41ef618c3a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the primary URLs extracted is trafftec.ru, which is likely part of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://trafftec.ru/123?utm_term=powered+by+fate+podcast PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408984/normal_5fd1d2ebf1c3d.pdfIn PDF document text
    • https://fuwefepitebu.weebly.com/uploads/1/3/4/7/134709748/depepafinebuv.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/heiieif/31637240373.pdfIn PDF document text
    • https://duvinibekumexeg.weebly.com/uploads/1/3/4/6/134677329/4496788.pdfIn PDF document text
    • https://suganolorifumu.weebly.com/uploads/1/3/0/8/130814011/946e6d87acb055b.pdfIn PDF document text
    • https://wilowepixamu.weebly.com/uploads/1/3/4/4/134476622/0ac30160.pdfIn PDF document text
    • https://zinuwikisabarek.weebly.com/uploads/1/3/4/6/134679236/4502780.pdfIn PDF document text
    • https://jilukixewe.weebly.com/uploads/1/3/4/0/134042659/numuwesosud_zakozuguwudavo_jubemozitonufe.pdfIn PDF document text
    • https://cdn.sqhk.co/zolokike/hmigyhh/2nd_grade_reading_comprehension_worksheets_multiple_choice.pdfIn PDF document text
    • https://fuxarudoniw.weebly.com/uploads/1/3/5/3/135350341/sijabaxeluboro-gezorawigan.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/bipepezuwed/logique_et_argumentation.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/organizational_change_management_communication_plan_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1baca535-c220-47f2-a199-1830027d80d4/sowisugajoxupazat.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13682 5452 bytes
SHA-256: 8e72f3c1caa1b18942b644fb671151b3e6a4ed0b5abc83e9a9032e6d97924b58
font_01_sfnt_off00014929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14929 2140 bytes
SHA-256: 289854c0292170102eeea8cd8d9fa039b7e5adf06f71653ea533c14c4e2d2c34
font_02_sfnt_off00015304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15304 11996 bytes
SHA-256: d877685549546d68c554c16c631b4a5946f778f5a7f3ecdfeeb08edfc25e141a
font_03_sfnt_off00017b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B55 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf

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