Malicious PDF — malware analysis report

Static analysis result for SHA-256 357ec78851320f3d…

MALICIOUS

PDF

79.8 KB Created: 2020-11-21 07:02:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d20f538479612e94e977e92f76be83a3 SHA-1: ea978fa89cdd621c4fabf9752bdd6525d52a5616 SHA-256: 357ec78851320f3d67c07ca2a0d7ee6540833139d00fdeccf3c750e5234b4a59
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms or phishing lures, as indicated by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/aws?utm_term=gmat+practice+test+pdf+2018
    • https://dozasasakebo.weebly.com/uploads/1/3/1/1/131164234/nifor-xilimok.pdf
    • https://wibarojadika.weebly.com/uploads/1/3/4/6/134689619/159e6c3b2c50.pdf
    • https://dugizixenopiloj.weebly.com/uploads/1/3/4/4/134457585/4684611.pdf
    • https://nibuxapevu.weebly.com/uploads/1/3/4/6/134601724/d617f17.pdf
    • https://pumewigegokofav.weebly.com/uploads/1/3/4/3/134317234/nuletixuwa.pdf
    • https://kidunaxu.weebly.com/uploads/1/3/1/4/131437100/4804ab39a36.pdf
    • https://jigaxamika.weebly.com/uploads/1/3/4/6/134610035/965c4ab9f4e67.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jotizifime/jurubigowuguxateno.pdf
    • https://s3.amazonaws.com/gofilafixu/create_master_excel_sheet.pdf
    • https://s3.amazonaws.com/wutezigojuxi/64091246954.pdf
    • https://uploads.strikinglycdn.com/files/bcdf8431-d20c-445a-8842-8b34fcfd2093/zosojopomafizoxurupadozit.pdf
    • https://s3.amazonaws.com/libosokune/69578919154.pdf
    • https://s3.amazonaws.com/mozirolinitaje/diablo_2_single_player_character_editor.pdf
    • https://uploads.strikinglycdn.com/files/815e7277-0466-47c2-9de7-47303be18068/1102656474.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_off0000f6e5.bin
019402d9a8a91d0198f6a68bce0c9b8807d23a62fb9c5e4edba6aa89e8378ae3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E5 5820 bytes
font_01_sfnt_off00010aa4.bin
0c15937c5127f5ceb102210acfaa2759056240e11cb172ac4fe86fbca908deb9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA4 11708 bytes