Malicious PDF — malware analysis report

Static analysis result for SHA-256 b974763ea9cd197a…

MALICIOUS

PDF

68.1 KB Created: 2021-02-22 02:26:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 12be9c98736282230c2df171f2f4169d SHA-1: b09459624ae4e91370d5181ef965fa7e081f4813 SHA-256: b974763ea9cd197a336442780aab60d50fb7f1210c9a58a328d20d40c59d9e2f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, many pointing to PDFs hosted on various platforms, suggesting a link farm or distribution network. One prominent URL, 'https://bologen.ru/strik?utm_term=how+to+program+fire+tv+remote+to+control+tv', is embedded in the document's metadata and likely serves as the primary lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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 https://bologen.ru/strik?utm_term=how+to+program+fire+tv+remote+to+control+tv PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383804/normal_5ff3d93ee426c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377662/normal_5fdc6fade1078.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382952/normal_5fd8d99a98d06.pdfIn PDF document text
    • https://dawekemukodo.weebly.com/uploads/1/3/4/4/134491409/f33b6f858803e.pdfIn PDF document text
    • http://usmileofficial.site/larex8uog5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462038/normal_5fd34e4f84647.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/daselex/dehn_surge_arrester.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/ashish_patil_all_video_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/game_toy_defense_3_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/rotadaroper.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/cahier_de_vacances_pour_adultes_gratuit.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC22D 5060 bytes
SHA-256: 11265b3b8b5d62b2755fec7f3c144c114ce7b6338a0a231b681f30cf9a6e66ec
font_01_sfnt_off0000d35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35D 9884 bytes
SHA-256: 93f2787afcf8c240dbbaee30185c328c00615974129ee9d6d825944490ecf8d2
font_02_sfnt_off0000f53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53C 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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