Malicious PDF — malware analysis report

Static analysis result for SHA-256 935b159e70ea9755…

MALICIOUS

PDF

67.6 KB Created: 2020-11-23 12:26:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f0b1bdc0951de3290933e8169044c35 SHA-1: 1148d4809e243b90a80252197e972429a78d16ec SHA-256: 935b159e70ea975545e3828a9908d1a1cd642d00b0195067e2e5cb9bedde895e
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs points to a downloader or redirector pattern.

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
  • 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
  • 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/strik?utm_term=dedsec+ctos+access+%2528ios+app%2529+download
    • https://kelinabak.weebly.com/uploads/1/3/4/7/134728495/0ecbe554378efa.pdf
    • https://cdn-cms.f-static.net/uploads/4407086/normal_5fa84e61427cb.pdf
    • https://cdn-cms.f-static.net/uploads/4385206/normal_5f9fe01890bda.pdf
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/gasipus-wijux.pdf
    • https://cdn-cms.f-static.net/uploads/4424036/normal_5fb6a216830c3.pdf
    • https://gogipemefa.weebly.com/uploads/1/3/4/4/134471158/0e44713d3a900.pdf
    • https://cdn-cms.f-static.net/uploads/4491439/normal_5fad788e284e6.pdf
    • https://murusezikarif.weebly.com/uploads/1/3/4/4/134436274/3240192.pdf
    • https://cdn-cms.f-static.net/uploads/4382621/normal_5f91821e8d69e.pdf
    • https://cdn-cms.f-static.net/uploads/4379474/normal_5f8f41ac2e10c.pdf
    • https://ximinelinax.weebly.com/uploads/1/3/4/3/134313791/zonisirebetadep.pdf
    • https://tujebikofo.weebly.com/uploads/1/3/4/3/134359874/67a828.pdf
    • https://cdn-cms.f-static.net/uploads/4452835/normal_5fa9cae554ce2.pdf
    • https://ganunuzarije.weebly.com/uploads/1/3/4/5/134518475/4252692.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zamuriza/bullying_titles_for_an_essay.pdf
    • https://s3.amazonaws.com/xanebavifamopez/82903372731.pdf
    • https://uploads.strikinglycdn.com/files/bb61c4e2-8d3d-49da-a38f-8dacdfaa72df/pavumidotadotowexuza.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_off0000cabe.bin
2db46e5a16ad2de4c13283cb91e3c89b5833a81709bf5ea4c25af65de34de645		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCABE 5216 bytes
font_01_sfnt_off0000dcb8.bin
140eeca96d47c10ffd5d72ceb0cab919186ea9b382396f2b9bc42e67a0e44186		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB8 10680 bytes

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