Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ccd6a3db531685…

MALICIOUS

PDF

75.2 KB Created: 2021-02-26 17:56:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13c671cc53f5823a32ecda819156883c SHA-1: d50f752338577563b77c6cfd12b288d8c52b9139 SHA-256: 31ccd6a3db531685e25c3876c5752fc1fc8cfa4f7865123af54ac8f23b8ab680
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, identified as a link farm, and is flagged by ML classifiers and ClamAV as malicious. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam pretext. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure indicate an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://nipisod.ru/123?utm_term=gmat+official+guide+2021
    • https://cdn-cms.f-static.net/uploads/4422137/normal_5fd2dd1721eff.pdf
    • https://dotuxebi.weebly.com/uploads/1/3/1/4/131454754/98578.pdf
    • https://resodarapasak.weebly.com/uploads/1/3/4/6/134659305/16fcb0c4.pdf
    • https://cdn.sqhk.co/zomulusiku/geihhjU/debixix.pdf
    • https://keziputaxa.weebly.com/uploads/1/3/2/7/132711938/337559dc22d.pdf
    • https://static.s123-cdn-static.com/uploads/4426062/normal_5ffa1bdf376f3.pdf
    • https://cdn-cms.f-static.net/uploads/4369630/normal_5fe774206b2a1.pdf
    • http://kojazunupetip.mygamesonline.org/zedakakuzavofesobufibufa.pdf
    • https://cdn-cms.f-static.net/uploads/4421049/normal_600de9b88bd0e.pdf
    • https://cdn-cms.f-static.net/uploads/4413110/normal_6032a9c109381.pdf
    • https://cdn-cms.f-static.net/uploads/4485810/normal_600ade06ae9f1.pdf
    • https://zuveravovizopow.weebly.com/uploads/1/3/0/9/130969477/4903b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kegipufi.rf.gd/inventory_html_template.pdf
    • http://nukilaba.myartsonline.com/27340995914.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_off0000e7d9.bin
8dafe5cd5ddf59ad274fbb70ad6ad9b288431a5ea0d498ffd4e46decf7fe4223		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D9 5424 bytes
font_01_sfnt_off0000fa46.bin
3c2629e39816a90c65a34e606ec621cd4da685cd2e9d9cd5a92371ef597219cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA46 11020 bytes

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