Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf34f0c46e74fd4…

MALICIOUS

PDF

75.2 KB Created: 2020-11-13 19:26:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 626fc3650c80379eb8c9e5fdb1f748ff SHA-1: d5a68302ae62b1e3fd72a6b71b73e5249971ad9a SHA-256: 1cf34f0c46e74fd4a9666de45625054db808d34ef30ee91158dac7318664ebdb
156 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URIs. The presence of a PDF_SEO_LINK_FARM heuristic firing indicates a high volume of links, including one pointing to a potential executable download. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to malicious or unwanted content, likely for phishing or malware distribution.

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 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/strik?utm_term=dell+inspiron+3558 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387031/normal_5f8ca8d316c93.pdfIn PDF document text
    • https://zoxipunawogedo.weebly.com/uploads/1/3/4/2/134235683/mejibalodiwunaj.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/xanofamaja/download_happy_wheels_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/cranberry_bread_in_bread_machine_recipe.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/72713629941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d330d2df-c454-4452-9014-9acf7bfbd2e2/rokufabobadifenenakep.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/the_book_of_shemaiah_the_prophet.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/87510016357.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/45969313013.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/character_trait_list_positive.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/maplestory_4th_job_leafre.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_off0000cae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE4 5084 bytes
SHA-256: 4c7dfc764f8868650f991135415c19f37aad26fe65ba7c90e82766876cf32491
font_01_sfnt_off0000dc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC49 14512 bytes
SHA-256: 5d9044dff8c567871caa98397679d36a86ced3acf6c9a5033af4f7fb15af3735
font_02_sfnt_off000109d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D8 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2

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