Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11a2d276782bc6e…

MALICIOUS

PDF

40.8 KB Created: 2020-03-29 01:47:46 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 17f757d6efd7ae15315abd2c246951e3 SHA-1: 97e1d1d29cc37b0011360478bf10eedd5ad6fadf SHA-256: f11a2d276782bc6e180578a768487d0f003ef3b6fc00bc3a16c2f5fb271af6b3
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, many of which point to other PDF files hosted on similar domains. This indicates a link farm or SEO spamming technique, likely intended to drive traffic to malicious content or phishing pages. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, so the primary attack vector appears to be the manipulation of search engine results and user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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 http://74-123-72-249.mgwnet.com/uploads/1/3/0/6/130604010/130604010.html#icd+9+code+for+left+foot+ulcer
    • http://popup-nyc.com/uploads/1/3/0/4/130476751/4092590.pdf
    • http://seattleairportshuttlecompany.com/uploads/1/3/0/5/130588213/7615928.pdf
    • http://zreneacreates.com/uploads/1/3/0/5/130589431/ccfda65f38199c.pdf
    • http://towntaxservices.com/uploads/1/3/0/4/130476442/sipotikusa_mifakavane.pdf
    • http://tecladomusicinstitute.com/uploads/1/3/0/5/130541327/tuzoziw-jasegebam-jilirupiru-bebawerided.pdf
    • http://mikewoodhead.com/uploads/1/3/0/4/130476085/toxoge_doguvugap_fumufe.pdf
    • http://mta-sts.smtp.villageofhopeministries.org/uploads/1/3/0/7/130775623/zeduzum_lexogatelu_xororebesenox.pdf
    • http://asianart.studio/uploads/1/3/0/8/130813025/491479.pdf
    • http://smartbuytrader.com/uploads/1/3/0/4/130478160/7965432.pdf
    • http://thumbderstruck.com/uploads/1/3/0/6/130621477/4dc6a.pdf
    • http://www.basiccomputertutoring.com/uploads/1/3/0/6/130640181/sureje-xilexaxap.pdf
    • http://darwinelitelandscaping.com/uploads/1/3/0/4/130483480/zamezekogona-narip-kudedetumaje.pdf
    • http://xvjpf.com/uploads/1/3/0/6/130639701/gonutaw.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007af2.bin
86eed28d1817a570907d56928a92a3a9bc1a74e8b9f91f3deca1fb0d7fe33014		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF2 6748 bytes

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