Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b02641f69289183…

MALICIOUS

PDF

83.2 KB Created: 2021-01-14 12:10:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 46d432875fd05bccf2e5c13b00b1e248 SHA-1: 7a0a7a5b005843d67f1afd425edd711191e8cff0 SHA-256: 6b02641f6928918377e6a2a86a1cac0f3412a36b42e64483a64d0025bbea3d7d
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links pointing to various external PDF files hosted on disposable domains, indicating a link farm for SEO manipulation or to distribute further malicious content. One critical heuristic identified a link to known malicious redirector infrastructure, and ClamAV detected the file as Pdf.Phishing.Trojan. This suggests the document is part of a phishing or malicious content distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=society+of+automotive+engineers+turn+signal+study In PDF document text
    • https://vasukoxenubepez.weebly.com/uploads/1/3/4/4/134475355/fixefokizeg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465941/normal_5fe3c035ebb67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368976/normal_5f87de85b96da.pdfIn PDF document text
    • https://site-1168177.mozfiles.com/files/1168177/20766358499.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370071/normal_5f8830241a29f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408483/normal_5f94a36c0ca3c.pdfIn PDF document text
    • https://site-1177364.mozfiles.com/files/1177364/24929274626.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410002/normal_5f9627baa2656.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379387/normal_5f8b4fb7a0e16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453335/normal_5fc74ccc279f2.pdfIn PDF document text
    • https://site-1192441.mozfiles.com/files/1192441/19425684286.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476446/normal_5faf29abdb7db.pdfIn PDF document text
    • https://zuwumepegowivos.weebly.com/uploads/1/3/1/0/131069935/3627798.pdfIn PDF document text
    • https://luvoseguz.weebly.com/uploads/1/3/4/6/134665560/9999ab5a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000113ef.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x113EF 24504 bytes
SHA-256: 6ba3ffe663397426eca8ac9479b66861c14c2a2e3f551fb776fe3e1906c34ca3
font_00_sfnt_off0000da09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA09 5604 bytes
SHA-256: 0009e7bc416e6dd9f70ea5c5a021f922dd9ab870818796f900318657a6f18af9
font_01_sfnt_off0000ed1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 11324 bytes
SHA-256: 49b2d4d7e973153ad12f13ba50bf3749aaa8b271ae437853a0a37c111d3bff4e

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