Malicious PDF — malware analysis report

Static analysis result for SHA-256 6623e05932e2fbff…

MALICIOUS

PDF

77.0 KB Created: 2020-12-02 03:24:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3d51fb8ea7b0c3ecc1c3159af08fad2d SHA-1: 98f312a2af15d49e85ba3f42ce2f0121eb5afe72 SHA-256: 6623e05932e2fbff1a88446f1248279baeeda10283efa24211d929f488adef0b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://trafffi.ru/strik?utm_term=what+is+the+half+life+of+an+isotope PDF link annotation
    • https://mavegisokelu.weebly.com/uploads/1/3/4/1/134131346/mokuk-gefot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372383/normal_5fc17b7f227cb.pdfIn PDF document text
    • https://wajativakol.weebly.com/uploads/1/3/4/7/134749030/5122202.pdfIn PDF document text
    • https://rozemubopul.weebly.com/uploads/1/3/4/7/134719755/1185633.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484639/normal_5fc11722e5f71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446774/normal_5fb8afd4a06f5.pdfIn PDF document text
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/7759817.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368763/normal_5fa88255392d4.pdfIn PDF document text
    • https://satobawugeg.weebly.com/uploads/1/3/4/7/134701522/kezotuxajowobomif.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/bivanud/14675342978.pdfIn PDF document text
    • https://s3.amazonaws.com/vibove/unblocked_games_24h.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/ropes.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/77251843235.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/careers_in_agriculture_worksheet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc15a4327a199023ab881d8/t/5fc417846457125654bc2878/1606686596828/93906377141.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0E 4908 bytes
SHA-256: 305c547b443f9197592e562330bcfb1a06ce8d8d0f2d234f4b5a0a7521f96f58
font_01_sfnt_off0000ead1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD1 11392 bytes
SHA-256: b499554cb3002b37acb3c2b82452a76731ba830eee86b2f8c4756701978dbd73
font_02_sfnt_off00011201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11201 16096 bytes
SHA-256: 9853a4a918762215dfcba51349555ff48d39e56332efe18e2f333ca30d8a5b61

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