Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c4f358cf1738667…

MALICIOUS

PDF

73.2 KB Created: 2020-12-26 19:00:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 00ef59b542026a98ebecfd84d90caf93 SHA-1: 70d8cfada8836b32f67bb243a4588177228202df SHA-256: 5c4f358cf17386675657a9bbdd61173fbf4a2f1a2e9384df95d2e49eb3e0fbe3
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting services, and one critical link to known malicious redirector infrastructure. This indicates a link farm designed to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ggtraff.ru/aws?utm_term=android+tv+box+terbaik+murah In PDF document text
    • https://lozulijulejibog.weebly.com/uploads/1/3/1/8/131857057/votiserujinobix-tolasafej-vaxuf-tugubemajexed.pdfIn PDF document text
    • https://gotumofavi.weebly.com/uploads/1/3/4/6/134602885/5277883.pdfIn PDF document text
    • https://wumikedamuzu.weebly.com/uploads/1/3/4/3/134324885/gatakem-kajisupekeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417535/normal_5f99c774f29e8.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/ia0idie/26428706115.pdfIn PDF document text
    • https://munivimisidifi.weebly.com/uploads/1/3/4/7/134772296/74e76632e8fa49.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzosexiwugu/Peju8gh/13485260712.pdfIn PDF document text
    • https://juzifadolugigom.weebly.com/uploads/1/3/4/3/134324721/pubidalikozup-darigeni-tanotubifujun-rokikoxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384645/normal_5f93567593a3f.pdfIn PDF document text
    • https://wadazujirala.weebly.com/uploads/1/3/4/5/134596454/sabixowuzogot_xefugu.pdfIn PDF document text
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/d82a673a02.pdfIn PDF document text
    • https://guboriratuji.weebly.com/uploads/1/3/4/2/134235556/ad4f0324.pdfIn PDF document text
    • https://cdn.sqhk.co/fejavegiwo/l9idUgg/infinity_pool_builder_near_me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18D 5176 bytes
SHA-256: df35f9683ce9123774855172998fa51dca0f4b75ffc13e1806342d86f11011a9
font_01_sfnt_off0000f30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30A 10964 bytes
SHA-256: bea922c8275220ab25d45dd120a2e7252cd20494e911c85ea58020e24afe127a

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