Malicious PDF — malware analysis report

Static analysis result for SHA-256 336ea3fe77eb3ee5…

MALICIOUS

PDF

66.5 KB Created: 2020-11-13 04:54:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87aa8d74273b94c7558ba585742b458c SHA-1: 1d77092154f44905fc5ed05390f55992c623b770 SHA-256: 336ea3fe77eb3ee5e89125b0cb1f50034a5f35fd770ab97c95e9d60623ee748b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with one prominent URL pointing to a suspicious domain. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through the linked PDFs. No scripts were extracted, but the PDF structure itself is used to facilitate the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/aws?utm_term=spiderman+pointing+meme+template
    • https://cdn-cms.f-static.net/uploads/4446499/normal_5f9de88554bcf.pdf
    • https://cdn-cms.f-static.net/uploads/4370561/normal_5f9e4572d6581.pdf
    • https://cdn-cms.f-static.net/uploads/4366325/normal_5fa1912542fe6.pdf
    • https://depatimuxuzox.weebly.com/uploads/1/3/4/4/134404048/woxeropexuvegixet.pdf
    • https://dupizonax.weebly.com/uploads/1/3/1/3/131380343/tafabukujonazisut.pdf
    • https://xeseboda.weebly.com/uploads/1/3/4/3/134323550/dekofanidaxajaw.pdf
    • https://cdn-cms.f-static.net/uploads/4417658/normal_5f9d6b61b1911.pdf
    • https://cdn-cms.f-static.net/uploads/4375705/normal_5f996fa79bf94.pdf
    • https://cdn-cms.f-static.net/uploads/4378606/normal_5f9c1ee8387ea.pdf
    • https://lavuzolitad.weebly.com/uploads/1/3/4/3/134327879/5419106.pdf
    • https://cdn-cms.f-static.net/uploads/4485818/normal_5fa80856b5d66.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/42115d74-4419-470f-b920-b5b3355bc44a/8633545419.pdf
    • https://uploads.strikinglycdn.com/files/9ec0e10a-4fad-4649-955c-ff853feddda8/zatiduwadupezonu.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_off0000c849.bin
7df9583b04c5302d764493277d7342fdc91a5e0630e2b3020a3d69fe43053efb
pdf-font-stream PDF embedded font (sfnt) at offset 0xC849 5204 bytes
font_01_sfnt_off0000d9e1.bin
15d5004242c7a85845fbda0116814fbc4bb9223e38e71c366ceeb23c47fd0305
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E1 10228 bytes