Malicious PDF — malware analysis report

Static analysis result for SHA-256 856df7629e4e18bd…

MALICIOUS

PDF

77.5 KB Created: 2021-02-24 18:06:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: be4a18e63e4249aa28ee12580a8e4381 SHA-1: 7ada07b7e7f411f3c4737ac9461f86d755c3a186 SHA-256: 856df7629e4e18bd9d05f60b55ab829262b05fb06ef5b8f81385a442f4334f4a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of numerous external URLs, including one at 'bologen.ru', points towards a phishing or content distribution scheme.

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 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=which+echo+show+is+best PDF link annotation
    • https://cdn.sqhk.co/pemiduwegam/Vd9BqQs/ftdx101d_best_price.pdfIn PDF document text
    • https://cdn.sqhk.co/visukodo/lihjeXA/33613273887.pdfIn PDF document text
    • https://cdn.sqhk.co/riwifesineji/jA65Thj/kpop_male_idol_popularity_ranking.pdfIn PDF document text
    • https://cdn.sqhk.co/dabigewom/cheidji/followers_up_with_perfect_caption_mod_apk.pdfIn PDF document text
    • https://fonabanobegax.weebly.com/uploads/1/3/1/6/131636781/jeredovunap_sawuxatafosop.pdfIn PDF document text
    • https://cdn.sqhk.co/sidamebo/5haopia/sobojafavuwozi.pdfIn PDF document text
    • https://puwulafu.weebly.com/uploads/1/3/5/3/135329465/9116262.pdfIn PDF document text
    • https://cdn.sqhk.co/tabakotodi/gfgcVhb/.pdfIn PDF document text
    • https://fugunukotuji.weebly.com/uploads/1/3/4/5/134589730/670ea.pdfIn PDF document text
    • https://popuvagilubasi.weebly.com/uploads/1/3/4/0/134018524/ee4681cd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vefibuvusesusu.rf.gd/bivewilakil.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/aspen_hysys_10.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/archspire_involuntary_doppelganger.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_off0000f2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AB 4792 bytes
SHA-256: 7dbed280e7c3ba54092dc57ccc2d61b88d203d239d74e973d1f9e7728e308adb
font_01_sfnt_off00010318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10318 11128 bytes
SHA-256: 70048c19bbac539db2bbff35c656ac24644d62b9e3ec3ad876c7e0beef39c589

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