Malicious PDF — malware analysis report

Static analysis result for SHA-256 312e5c76d59dc977…

MALICIOUS

PDF

76.8 KB Created: 2021-01-12 00:26:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02d7f31642014ab1fc31073b713a2b60 SHA-1: ef341e2e05410caf9d240d0880cbe365a628e2ab SHA-256: 312e5c76d59dc977b4ffc640d09ea3069d586018a0b3b3a82f0d4675f83f7e4f
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 pointing to PDF files hosted on file-sharing services, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=cable+tv+amplifier+splitter
    • https://site-1220394.mozfiles.com/files/1220394/riwevuselisa.pdf
    • https://zimegusak.weebly.com/uploads/1/3/4/6/134605775/ragajujesuporufo.pdf
    • https://bozixezexa.weebly.com/uploads/1/3/4/8/134861503/rujuvatare-rozati.pdf
    • https://cdn.sqhk.co/lodikorep/2FUMWz7/ted_lasso_review.pdf
    • https://site-1240846.mozfiles.com/files/1240846/dazifupukevu.pdf
    • https://site-1172486.mozfiles.com/files/1172486/download_my_talking_hank_mod_apk_home.pdf
    • https://site-1244917.mozfiles.com/files/1244917/26821777756.pdf
    • https://cdn.sqhk.co/vunelebu/VyQGndO/flights_to_denver_from_dallas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/fidefofudi/woduzapowivazuwedudeja.pdf
    • https://s3.amazonaws.com/xisakazelelinim/47227317200.pdf
    • https://s3.amazonaws.com/xefejevife/88142795066.pdf
    • https://s3.amazonaws.com/jovekus/sovebegasefi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3af.bin
1a366c4b8a464dccd5d4c2501aaadb52462db5d024fa1c7546b453278a96f95d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AF 4840 bytes
font_01_sfnt_off0000f42d.bin
714690a87cb6d6ee3142e62d22c8468d6b88076c044a5a75154824502372b49a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF42D 10676 bytes
font_02_sfnt_off00011898.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x11898 4324 bytes