Malicious PDF — malware analysis report

Static analysis result for SHA-256 274b5dda1c1430a7…

MALICIOUS

PDF

64.9 KB Created: 2020-12-10 03:20:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4c17b68d358d9c1b485f44397b761587 SHA-1: 905376c4a5fa0ad36d6cfb9d1a6a24ae64233513 SHA-256: 274b5dda1c1430a7672fcebc9c7f80d6fe3b454b05c293a3fdd72e22f1316c22
156 Risk Score

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. 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 0.9996

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 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.
  • 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://traffnew.ru/123?utm_term=silent+night+piano+sheet+music PDF link annotation
    • https://retujesa.weebly.com/uploads/1/3/4/5/134529196/vorofuzevo.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/81262d56-7f46-4188-9c69-d5a18a63a0dc/70545893551.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/kupitigakimem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fda8536e-111d-46d3-ab22-ba3242f6fa52/27788599193.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/744edaa1-60bf-4800-b506-d61a8f637d7f/jutolexida.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/18464427807.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/36344038181.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7729e67-7c1b-4559-8636-97c592928e38/block_physics_mod_minecraft_1.11.2.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/minecraft_1.9_unblocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12120b9a-9869-42f9-85f4-a0f2a8275072/greek_mythology_short_stories.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC249 5356 bytes
SHA-256: bd95cd63893ea8631bc4f9447520fb4b2fd27c4590acd728e29961dd018e2f17
font_01_sfnt_off0000d45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45B 10196 bytes
SHA-256: d7bb1fe3a29cbba24419199c58933b316bbe360e1e155cf3a4fb576164e91723