Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb324b5e736da62…

MALICIOUS

PDF

68.1 KB Created: 2020-11-19 17:04:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 32558c1e140d64312d411be10a692914 SHA-1: 9dd878154e61224809c31bded7f81da7f47bd5f8 SHA-256: ecb324b5e736da62f59c58f2a8d37d4cc0962deac3b1263e85b2dfa029eeece3
176 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. 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 0.9997

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/123?utm_term=pokemon+trade+reddit+discord PDF link annotation
    • https://vovufopoxin.weebly.com/uploads/1/3/4/4/134466437/jegabofiviful-zoxorudoneleji-ponara.pdfIn PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/lorubavevotu.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/abd45e8c87e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456132/normal_5fb3e36d7c0a8.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/3b416ddb-da90-4c72-a905-13d8513be254/15585474470.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7f1be9d-947e-4adf-bbaa-c0dabf5dc286/pavepapasizimu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba7c54f8-14ee-46a6-8147-691a58948687/955150117.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5df5691e-0ccc-4d66-a7bb-20b131469f3d/59311195108.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21bba12c-73b3-427a-b4e2-28296b034c24/tatejosupatoma.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/dr_bolio_dieta.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/worlds_hardest_games.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD4B 6588 bytes
SHA-256: 4e1a9c4cb32f1bc4ff176ae4dc1460c31b2d267bf2def0252f23ad2731e7be72
font_01_sfnt_off0000cdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC4 5116 bytes
SHA-256: 6fca66733979fea10f6de55029eb1c2058bba3726b8a95213d7bed943286c166
font_02_sfnt_off0000df1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1B 10580 bytes
SHA-256: c31006f216fc118aa902497cac373dbc52faf6a69be39be24e71547adfc07e48

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