Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e3b7237ecd5f23c…

MALICIOUS

PDF

60.6 KB Created: 2020-11-13 17:03:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: eb045d6c7e437eedfe2a2bfa02a13017 SHA-1: 1e5e2bc8570bea19b59c019280d1b3154d9f8a63 SHA-256: 3e3b7237ecd5f23c00258e1ec7307cea7af06cae893b4aae581d3f5648ca1e8f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to distribute malicious content. The presence of a URL like 'trafffi.ru/strik?utm_term=ms+wordpad+free+download' indicates a lure to download software, which is a common phishing tactic. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/strik?utm_term=ms+wordpad+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366312/normal_5f871a4c6c978.pdfIn PDF document text
    • https://zifusotoxiwi.weebly.com/uploads/1/3/4/4/134476210/31efc0de0.pdfIn PDF document text
    • https://kekerisasil.weebly.com/uploads/1/3/0/7/130775365/finonuk-vipulotoj-lenati.pdfIn PDF document text
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/kuwekewugi.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/zobuwubedak/jixivusadunewesunejisu.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/boneless_girl_game.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/sm56_helper._exe_xp.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/the_celestial_ship_of_the_north.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/918306bc-159a-486d-a42a-6bd23061b438/63363057217.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/lake_harris_park_nc_wake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/780f1b58-6320-4ad7-8622-9ce30a3b93d4/jozetasatoxut.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_off0000b21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB21D 5132 bytes
SHA-256: 26359d73960b2811ffcb4f06da1a2546c037a7116130f7368cd82d21b82a854e
font_01_sfnt_off0000c3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C0 10004 bytes
SHA-256: 2c0042509a44447bd72b7842e826da35c9b22536f9c94e48f9e61300d0ca7f30