Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5c5185de11977a…

MALICIOUS

PDF

126.1 KB Created: 2021-03-23 16:17:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a980eb74d3ffaee7436110bc0052f5e7 SHA-1: 56a9de47bb480b108b18aed1e88a84b6dd8cdf3e SHA-256: ff5c5185de11977a07733f68199b321eb8db79a3c0b5831c5115d75579adc8ec
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it is part of a link farm or phishing campaign. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate the document's purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://leonvi.ru/wix?keyword=ns+railroad+train+symbols
    • https://cdn.sqhk.co/bapuwanuvadi/fuJWrOI/speech_assistant_aac_apk.pdf
    • https://cdn.sqhk.co/javomekoru/czrjctH/mumiwiderexokerizuz.pdf
    • https://vakogupomuniv.weebly.com/uploads/1/3/4/6/134610568/4382129.pdf
    • https://cdn.sqhk.co/ziriziwebu/iiEUche/pogusimoman.pdf
    • https://fojumotapikapig.weebly.com/uploads/1/3/4/3/134372119/cfc62a000a8.pdf
    • https://cdn.sqhk.co/pifajaloro/entieVW/21523629470.pdf
    • https://kobadoxe.weebly.com/uploads/1/3/4/3/134310171/zedovamep.pdf
    • https://cdn.sqhk.co/juzosugun/2MTheQP/spiral_cut_ham_costco_canada.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zosevid/vugonerapopagafigipebe.pdf
    • https://s3.amazonaws.com/neporezofov/soromegamifasibeloj.pdf
    • https://s3.amazonaws.com/sixenogafopoj/6699661738.pdf
    • http://gunijikape.rf.gd/kotuzareza.pdf
    • http://sijuvisa.rf.gd/pavetolomineliz.pdf
    • https://uploads.strikinglycdn.com/files/32b5700b-5e38-4678-be63-de2a214c79f8/marlin_336c_30_30_value.pdf
    • http://ritebumisopa.rf.gd/annalakshmi_restaurant_menu.pdf
    • https://s3.amazonaws.com/donukadizolin/podulozizojabazunuwivij.pdf
    • https://s3.amazonaws.com/silubebebefuju/gevibexo.pdf
    • https://uploads.strikinglycdn.com/files/e243127f-4a3d-48b4-b9bd-fd8f0dd139e9/zizesuxifimidajasav.pdf
    • https://uploads.strikinglycdn.com/files/901c645b-c5ae-4d79-a14f-a5097cd480fa/votowoxogibuj.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_off0001b42a.bin
40a20f33c892075fb534b5cc9becf3ee1357cdd22fed57019a497ad18f2e8d5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B42A 5184 bytes
font_01_sfnt_off0001c5b6.bin
f9108e152f6a49d97aff03c74abd8b198349720820bcde38f8428eb0bcb3058e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C5B6 10924 bytes