Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb261fccd83a4d84…

MALICIOUS

PDF

66.4 KB Created: 2020-11-25 12:08:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f85ec5de007a50ecef02729c7b91d1a6 SHA-1: d90da48bb7eb4fef1cb787735f54c573ba43e7e5 SHA-256: fb261fccd83a4d8425a0783dd193ee2caac08e092356731f55381707256fb42f
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 0.9997

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://trafficel.ru/aws?utm_term=aha+guidelines+hypothermia PDF link annotation
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/ac559f29b08b353.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458852/normal_5fb7819bbe45c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384460/normal_5f91489e40e13.pdfIn PDF document text
    • https://detasove.weebly.com/uploads/1/3/4/5/134594091/lapubizefeloretizof.pdfIn PDF document text
    • https://pagofere.weebly.com/uploads/1/3/1/3/131398194/4392059.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/3d76f803-c7f7-44c4-ab36-525aac83d222/delta_band_saw_guide_blocks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35296642-e6a1-49bf-84d1-d4753c1c54e8/jay_z_dead_presidents_2_download.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/80819380349.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/33605155419.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/omega_adventure_pack_modpack.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/4_hour_workweek_free.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_off0000c81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81F 5464 bytes
SHA-256: bcfc767b8e6de7137577c346fd954c0f44c5407c4cfae21facd1b82e33ecdd27
font_01_sfnt_off0000da96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA96 10172 bytes
SHA-256: 9e8a05335fd988395f0abdefd9a364417466790823e38845a181613caa1af456