Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fbdc01bd1fea64c…

MALICIOUS

PDF

60.0 KB Created: 2020-11-10 18:23:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 170b8333194850a990a2153ee8ae0ff7 SHA-1: 5e6a56b83f72e3a14196266005698b3c807ae4ad SHA-256: 8fbdc01bd1fea64c38f987a15b7986454cbc1b64559f301e50b1247a17c26ad8
214 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, and it contains a significant number of embedded URLs. Several of these URLs point to known malicious redirectors or are part of a link farm designed to distribute further malicious content. The document body, though heavily obfuscated, suggests a lure related to 'apk downloader cooking fever'. No scripts were extracted, but the presence of numerous malicious links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://gettraff.ru/123?keyword=apk+downloader+cooking+fever
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/lirulagemifolad.pdf
    • https://foruvojupizife.weebly.com/uploads/1/3/4/3/134352799/jigejex.pdf
    • https://viziwebaf.weebly.com/uploads/1/3/3/9/133999863/be2b1182e.pdf
    • https://ligibodi.weebly.com/uploads/1/3/4/4/134469997/8301548.pdf
    • https://xetutinafo.weebly.com/uploads/1/3/0/7/130775845/tepekikisakexusub.pdf
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/fa08ad1a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4c510657-42a8-49f0-82ed-fa2b2c758bb4/20982381013.pdf
    • https://uploads.strikinglycdn.com/files/b1a7884f-160f-4539-aa89-0080c7b2042c/67147184365.pdf
    • https://s3.amazonaws.com/jarawaxanivu/gedovud.pdf
    • https://s3.amazonaws.com/wixanarer/army_driver_training_crm_example.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_off0000ae07.bin
ffd3ca04740b040954adc4c1a865af9ab3456f4e51b4fe58e422587f404d80bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE07 5348 bytes
font_01_sfnt_off0000c06d.bin
48814a363e46ec82aea0a73720a02f5b9b4509beac95b823d707147765196ada
pdf-font-stream PDF embedded font (sfnt) at offset 0xC06D 10348 bytes