Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f16a4836932e04…

MALICIOUS

PDF

128.6 KB Created: 2020-11-18 13:48:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a8da070712ba0831c408ba893b48aa4 SHA-1: d23ea5162fc26884b39162817ae284042da2c87f SHA-256: 11f16a4836932e04d9f1dfd26fae8dd03f359ef30fa7a9b6f63f5cfa2ad27f61
222 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing for redirector links and a link farm. One of the primary links points to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffmen.ru/123?utm_term=final+fantasy+1+guide+pdf
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/15e006e8c48f.pdf
    • https://nawomabikovuz.weebly.com/uploads/1/3/4/7/134730946/vapozi.pdf
    • https://cdn-cms.f-static.net/uploads/4426828/normal_5f9f075c4ee12.pdf
    • https://cdn-cms.f-static.net/uploads/4384652/normal_5f8d6b0d12bd9.pdf
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5f96cdd995225.pdf
    • https://parudebizaju.weebly.com/uploads/1/3/4/0/134096066/wigivewawidek-gupisumitaz-zaxutotiwonax.pdf
    • https://cdn-cms.f-static.net/uploads/4370270/normal_5fb286825957c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xanebavifamopez/anatomy_of_the_spirit_by_caroline_myss_free_download.pdf
    • https://uploads.strikinglycdn.com/files/f98f7704-5954-45a9-ab6f-975be7527dce/zevanovogarakojelelu.pdf
    • https://s3.amazonaws.com/wiwuxot/jaundice_treatment_in_adults_guidelines.pdf
    • https://s3.amazonaws.com/fedojigudaj/point-slope_form_worksheet.pdf
    • https://s3.amazonaws.com/sinadi/mulunitunegomijimavonu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b011.bin
791ee7d573dfd96141b64f6b1cce28bd11a69e4a5c7a4f402283663fc3bd43bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B011 3660 bytes
font_01_sfnt_off0001bd22.bin
47e83d56386a09f1e0188381e5800c4f546ec0dac6ff3c831da186cf9b5d8e4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD22 5220 bytes
font_02_sfnt_off0001cf1a.bin
6e87610c53626b607a969f7acf6a9103b6837d761a7123277fe83f540df5b584		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF1A 10632 bytes

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