Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb1680e688bcbec…

MALICIOUS

PDF

74.5 KB Created: 2021-05-22 19:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ee23335972b83996ef2adbaee8bca937 SHA-1: 2f1391009be7c6ef3c5986ec1ca2d88edd6aaf8f SHA-256: 2fb1680e688bcbec1bd94285110159da19d62314a200bddbd06f7b476b1dcaf8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed for SEO spam or to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://fokemale.ru/strik?utm_term=algebra+2+5-5+practice+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374521/normal_601bfa40b9763.pdfIn PDF document text
    • https://litufefanim.weebly.com/uploads/1/3/4/9/134901191/82c09c685b1.pdfIn PDF document text
    • https://sexojeno.weebly.com/uploads/1/3/3/9/133997780/5854007.pdfIn PDF document text
    • https://giwaxevo.weebly.com/uploads/1/3/4/6/134644090/5010957.pdfIn PDF document text
    • https://gijesetezoludad.weebly.com/uploads/1/3/5/3/135348421/dugibokodepubopu.pdfIn PDF document text
    • https://degadita.weebly.com/uploads/1/3/5/9/135965793/rinukopalefog.pdfIn PDF document text
    • https://waxevinibiwe.weebly.com/uploads/1/3/0/9/130969944/susegetodu.pdfIn PDF document text
    • https://xanuvewetarew.weebly.com/uploads/1/3/4/7/134732967/1350122.pdfIn PDF document text
    • https://dirogine.weebly.com/uploads/1/3/0/7/130775503/9623407.pdfIn PDF document text
    • https://mebifexet.weebly.com/uploads/1/3/1/3/131381374/sedavejiloder.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465142/normal_6042970f67b63.pdfIn PDF document text
    • https://fezuwarojeti.weebly.com/uploads/1/3/1/3/131383544/fizexexafaxen_wuvopomogififar_nazetijipe.pdfIn PDF document text
    • https://zekasujiminog.weebly.com/uploads/1/3/4/3/134366003/zisitanojilese.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416810/normal_60488e2e1ff6d.pdfIn PDF document text
    • https://xonaxogurevof.weebly.com/uploads/1/3/1/4/131453171/mivesakiwonag-kedupotavulive-begesupefer.pdfIn PDF document text
    • https://poxolegap.weebly.com/uploads/1/3/1/0/131069824/1347220.pdfIn PDF document text
    • https://lakiregatu.weebly.com/uploads/1/3/4/5/134589313/3f8a00bc6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kotodur/chain_management.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromisixinolib/96800865971.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b88f7e69-02a2-4ce8-86f0-e6bfb12c2f2c/cva_wolf_muzzleloader_load_data.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1d676c4-f156-48de-995e-50fdb68eb133/sujexikisud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87c9af55-78cb-4400-8e7d-4ec5e8897cae/lojedekaf.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE265 5768 bytes
SHA-256: 739b40cbf0bd8e090aa09407c70a9f092f2035a64e7a6c5e087f64280230ab94
font_01_sfnt_off0000f627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF627 10756 bytes
SHA-256: 91d9f8ff7896135c9ee1c854c1ffee44fd04b252e13d281d99c248b72cb207cc