Malicious PDF — malware analysis report

Static analysis result for SHA-256 510dd8a073e59f8b…

MALICIOUS

PDF

79.7 KB Created: 2020-12-26 09:11:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd6570f6b35cf26104cedf98dfe81d7c SHA-1: d403131d1afbaf9232139dd2a8ed2e2baa1bb6e4 SHA-256: 510dd8a073e59f8b0ce640d86a2f83fed68facf436aef337ee05797881c579cb
176 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to Excel templates, and the presence of embedded URLs further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://trafffe.ru/aws?utm_term=bubble+chart+timeline+excel+template
    • https://vepifedufonun.weebly.com/uploads/1/3/1/4/131454255/bakojolapofi_pimirakoma.pdf
    • https://ronupajowosoza.weebly.com/uploads/1/3/4/8/134871490/14abb1b.pdf
    • https://pogipusuzifu.weebly.com/uploads/1/3/4/8/134869227/c3d9c1c441.pdf
    • https://disinuxokisukoz.weebly.com/uploads/1/3/4/6/134610262/jozoxax.pdf
    • https://tidovikazixuwuj.weebly.com/uploads/1/3/4/3/134316919/widazef.pdf
    • https://cdn.sqhk.co/kibizatududo/gfgPF9G/pulejinodufigujux.pdf
    • https://bapepewemeg.weebly.com/uploads/1/3/4/7/134702997/rekasonodulanupo.pdf
    • https://cdn.sqhk.co/tiwumixe/Ajiijie/bell_bird_feeders_new_zealand.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e09b3b61-93d2-480a-bd92-86c2d3765e09/free_kick_goals_messi_vs_ronaldo.pdf
    • https://uploads.strikinglycdn.com/files/e64afcf8-3669-4f01-a903-8a4e3a2d23c3/social_work_an_empowering_profession_8th_edition_free.pdf
    • https://uploads.strikinglycdn.com/files/4546e3e1-72e0-4b59-b6bf-b104894ed218/20363916173.pdf
    • https://uploads.strikinglycdn.com/files/075540ef-4c99-42a3-a671-4670d2cba461/service_level_agreement_example_project_management.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fad8.bin
2eb81a4423bc8478fc6f443884df982498deafeb79be3ed1c245d0d2bd081275
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD8 5252 bytes
font_01_sfnt_off00010c8e.bin
40aa209c3560bf1892b2dbc50b1c3b3af0422e4074f1248f5d03f9e8f1dc806c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8E 10880 bytes