Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0cc24e45df882ac…

MALICIOUS

PDF

75.4 KB Created: 2021-03-18 15:41:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d90546f58e1a6ac7b9f66fb827db5bcc SHA-1: c144ff4aaef3ddd9ddb1e5cd8a0a70b34934aad7 SHA-256: f0cc24e45df882acd401b90f5108c473f1fd71eb0b597c8de02d5373437f7f2b
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with a high-confidence heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, suggests a lure related to 'geotour worksheet b answers'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/wix?keyword=geotour+worksheet+b+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4377928/normal_5fc7536cc6d8c.pdfIn PDF document text
    • http://kejumazinanu.mywebcommunity.org/wusuliwivakiwif.pdfIn PDF document text
    • http://lodomujimujug.mywebcommunity.org/fender_super_champ_x2_amp_model_list.pdfIn PDF document text
    • http://nogeturafo.sportsontheweb.net/5261101935.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416787/normal_6004fb87008b2.pdfIn PDF document text
    • http://paxezimusosesa.scienceontheweb.net/network_interface_card.pdfIn PDF document text
    • http://watogoda.mypressonline.com/percy_jackson_and_the_lightning_thief_summary_chapter_15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461204/normal_60184b3941dad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lofunadex.myartsonline.com/biot_savart_law.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/fipamojosazuwefuposes.pdfIn PDF document text
    • https://s3.amazonaws.com/kovibu/adt_premise_pro_set_time.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/galletas_de_arroz_kupiec_informacion_nutricional.pdfIn PDF document text
    • https://ca7c05ed-d233-4774-9cf9-08ff86aa6c73.filesusr.com/ugd/b42fd6_51abb12f64484a04a525e0877568fd9e.pdf?index=trueIn PDF document text
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_15fcdcee313c4fbca67ec464c660320f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fizufapu/80885834845.pdfIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/craftsman_10_inch_sliding_compound_miter_saw_with_stand.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_off0000ea76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA76 5068 bytes
SHA-256: 37f2b66c7e51bbd65a0d26017b05477479343b4515baaddae4f92ba32ca1f862
font_01_sfnt_off0000fbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC2 10912 bytes
SHA-256: 9046d04675c1b3b0aac08b6b75990221f8cd21ad635fcc84163b46f7020e54d9

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