Malicious PDF — malware analysis report

Static analysis result for SHA-256 611805fbc3644618…

MALICIOUS

PDF

75.2 KB Created: 2021-02-17 01:43:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5ce98e2312d09b865a940413cdba95db SHA-1: de007e8bcfdc28d96e7486c0d1c5a6c1f8bd5336 SHA-256: 611805fbc3644618f6ec625b0025c1cabfae50b34603204ef56c3ebc5c19b969
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, exhibiting characteristics of a phishing or malware distribution campaign. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO poisoning tactic. The primary external URI, 'https://maypoin.ru/strik?utm_term=linksys+ac1200+mac+driver', is presented as a driver download, a common lure for users seeking technical support or software updates. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/strik?utm_term=linksys+ac1200+mac+driver PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414494/normal_5fd308c3520d1.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/AihXgg6/67460292883.pdfIn PDF document text
    • https://cdn.sqhk.co/minederepa/fhgvFID/road_rash_3d_cheat_codes.pdfIn PDF document text
    • https://cdn.sqhk.co/keropolor/d8Z0miB/82252812375.pdfIn PDF document text
    • https://cdn.sqhk.co/virurewev/Hzthfjf/mr_itou_knives_review.pdfIn PDF document text
    • https://dapijapivabug.weebly.com/uploads/1/3/4/3/134338952/8065182.pdfIn PDF document text
    • https://cdn.sqhk.co/guledijuxi/jc5Jjaj/60668763516.pdfIn PDF document text
    • https://cdn.sqhk.co/dutebosatu/KmmHOie/4060288184.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449793/normal_600499ccf1cbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_602367855ae62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495976/normal_600c153083b36.pdfIn PDF document text
    • https://cdn.sqhk.co/novozefox/geQ2hjf/234774955.pdfIn PDF document text
    • https://xowunaxevome.weebly.com/uploads/1/3/4/6/134679103/64cf68765f.pdfIn PDF document text
    • https://cdn.sqhk.co/jisaside/gDij9ag/flak_tank_wot.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/cjgsBgf/gimejibaseduvizivilapujak.pdfIn PDF document text
    • https://dinadexoliba.weebly.com/uploads/1/3/6/0/136091941/219444.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
    • 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_off0000db8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8D 5144 bytes
SHA-256: 367b5763b287071d262eae86953a20119ce25bb9b4e4c886dcd1db3e8daa3ac5
font_01_sfnt_off0000ecf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF2 10836 bytes
SHA-256: f1560973b4fe9b872e586b5f9410ba65328414325c2b3d992433a2d0c0657d01
font_02_sfnt_off00011207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11207 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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