Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dab41fff1947be0…

MALICIOUS

PDF

66.8 KB Created: 2020-12-03 03:38:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 286cae98b0466a2f83d45ff2b1028cc6 SHA-1: d9ae8450baa6db116e2b57433f22919428aa3311 SHA-256: 3dab41fff1947be0faa174d9f4aac696ade5e2140c9184a358a8909b564a5456
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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffi.ru/123?utm_term=the+girl+you+left+behind+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425214/normal_5fa5470aba137.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370097/normal_5f9b1e84c21f7.pdfIn PDF document text
    • https://barobinamad.weebly.com/uploads/1/3/4/7/134756413/livuzexezusul.pdfIn PDF document text
    • https://dojulukasinu.weebly.com/uploads/1/3/0/7/130776790/xalebekifanogejito.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478146/normal_5fb59fc4988d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473656/normal_5fba09a52157c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5bd940b6b03258f567eb7/t/5fc8117350c7b33622eafbbb/1606947187314/man_or_vampire_negotiation_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/580e5e39-3408-4312-a5d8-3c61ed5839fc/12468728264.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daf13611-eef0-4d37-be9b-6685bd52d08f/14958321539.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/40886799352.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc042db8787e8798968ae67/t/5fc38ab15147b14804a08e03/1606650546517/61086560226.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_off0000c848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC848 5104 bytes
SHA-256: 10f9345691566a9bd67c0e81d8fc0efb56d2d0490a4dbfa5122f447649927d50
font_01_sfnt_off0000d9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AD 10800 bytes
SHA-256: 248128e3daaa3536f16c1c6ea8ffd5ce969aa9d82d8fb8da3cb3291b455c6503