Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d2803b4db71227d…

MALICIOUS

PDF

87.8 KB Created: 2021-01-04 21:23:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 55ddb41b8d970c16e87879bf0c480b8c SHA-1: 98a710240968b56550156dbd116f2ad1061b403a SHA-256: 9d2803b4db71227d79268d9826036de3f68432e7e3a9a7c78160295f418c03eb
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'mass external PDF link farm'. The ML classifier and ClamAV detection strongly indicate maliciousness, classifying it as a phishing trojan. The presence of embedded URLs and the PDF structure suggest an attempt to redirect users to potentially malicious sites, likely for phishing or to download further payloads.

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://traffset.ru/aws?utm_term=microsemi+corp+annual+report PDF link annotation
    • https://cdn.sqhk.co/najuvotuwoz/cHoYgju/4865439039.pdfIn PDF document text
    • https://cdn.sqhk.co/vefuwebilux/ghhhjjd/the_bubble_shooter_story_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/lagitesavap/h1lijO6/nafatizo.pdfIn PDF document text
    • https://cdn.sqhk.co/relulapezele/7X6jd7i/tositodepifekufonoxoleg.pdfIn PDF document text
    • https://nurixuwabojud.weebly.com/uploads/1/3/4/5/134587723/sarefej.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/bodajaku/32879217289.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/retunodaralonilu.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/joiner_transformation_scenarios_in_informatica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b559272-61e4-4de8-ba42-c4752dc3aab6/10615399259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc376c43-2036-4a4e-8986-b8279cab314f/number_visuals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f976a752-ea0e-4937-b1b3-6df1d561f0db/94054938374.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F5 5084 bytes
SHA-256: 275d3057fed0e6a3fbfcc916c1a7c37cc65fd7232ebea60abb880bc69f6125e8
font_01_sfnt_off00012a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2F 11972 bytes
SHA-256: cf69e25f0ba1f4caad34a6ab525317fff025c041afc31d38e9befa972431e181

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