Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d0ab16f65531683…

MALICIOUS

PDF

72.2 KB Created: 2020-12-16 18:44:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 87ce0d14af54f298968373d687384986 SHA-1: 178a3a414257905b9602ca337d19feb8c30f6e2d SHA-256: 8d0ab16f6553168346367c75ab1893f055fcb4ea20b719c7df3b544031057622
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation scheme. The primary URL observed is traffset.ru, which is likely used for traffic redirection or to serve further malicious content.

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://traffset.ru/aws?utm_term=belong+nbn++speed PDF link annotation
    • https://fetevemukimagon.weebly.com/uploads/1/3/4/8/134896640/baremuxilipolama.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411250/normal_5fa7d9ff3936f.pdfIn PDF document text
    • https://piminuwimizo.weebly.com/uploads/1/3/4/6/134674326/6818241.pdfIn PDF document text
    • https://sufifova.weebly.com/uploads/1/3/4/7/134736026/tipugogebexojoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426571/normal_5fce643e31d66.pdfIn PDF document text
    • https://vinofuloro.weebly.com/uploads/1/3/4/8/134850824/lematekivinosudiriv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411479/normal_5fa3528050c07.pdfIn PDF document text
    • https://naxulukituno.weebly.com/uploads/1/3/4/8/134879135/5761003.pdfIn PDF document text
    • https://pusigodumutujor.weebly.com/uploads/1/3/4/6/134610993/xobatasa.pdfIn PDF document text
    • https://venatijaw.weebly.com/uploads/1/3/4/6/134680547/pojemafusaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/07eb56e2-1562-4938-becb-9a625ac8fbf6/wesozigesirolifipola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa3c6818-2d45-4084-8dd1-2d00e12c12c8/80467177232.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/292da87f-94a7-4cb8-8586-c001fa48b774/11381058180.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6c8f251-a805-4e65-b7bc-03bf64c057cb/moonshine_guide_rdr2_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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC884 5012 bytes
SHA-256: 0cc0a53ce1041b02190ff7ea8fbb353ca551705e7c0ac6777193f554b0e6e4a6
font_01_sfnt_off0000d9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A0 10912 bytes
SHA-256: 7a318fef0b172319ad83419ec02b64c0a0613d8871cf80d58dc0f726392dace0
font_02_sfnt_off0000ff1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1E 16140 bytes
SHA-256: 3f83bbfb2e03141a9083badfb1da6e2b1773f9aa6b1ed8f30fc2d392a5ee3553

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