Malicious PDF — malware analysis report

Static analysis result for SHA-256 a06d54aa90de894d…

MALICIOUS

PDF

79.0 KB Created: 2021-03-23 10:45:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 23b51935c0b117d3a66f43a39683aeaa SHA-1: 5e5cfe251ea9db8f60cb923b43bf553ac4769fc3 SHA-256: a06d54aa90de894d0d0fd71891ed6893f9727f7952524a843187f6eb9414ccea
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, many of which are hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript for malicious redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/award?keyword=character+traits+vocabulary+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4486563/normal_5fe1018a2f387.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371536/normal_60579d4b645b1.pdfIn PDF document text
    • http://meetly.space/hp_officejet_8600_printer_drivert71hv.pdfIn PDF document text
    • http://lady-bug.club/rubolegureji3qa89.pdfIn PDF document text
    • https://cdn.sqhk.co/goworonol/tjgZ6Lv/54865895823.pdfIn PDF document text
    • https://cdn.sqhk.co/mejiwimuza/fgJRrub/madafubisajep.pdfIn PDF document text
    • http://huaweistoreukr.xyz/matematicas_1_bachillerato_libroky3x2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485711/normal_5ff9dcb18c542.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384035/normal_60064fb6b36a7.pdfIn PDF document text
    • https://cdn.sqhk.co/jegamaxegev/wwhfEja/dress_up_party_salon_dish_washing_and_painting.pdfIn PDF document text
    • https://cdn.sqhk.co/nudizodi/jigcCjj/xls_gantt_chart_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460688/normal_60011cc37d17c.pdfIn PDF document text
    • http://igonlinesupport.com/20183498827i870b.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovipawe/Mji8iac/seduwamalonatutovixo.pdfIn PDF document text
    • https://cdn.sqhk.co/zerurukoraju/ihzggI4/33043499283.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389582/normal_6054577d6e8e2.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/7WhigeI/zoom_cloud_meetings_app_zoom._us.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482230/normal_604a1c1bb3984.pdfIn PDF document text
    • https://cdn.sqhk.co/duvetezoje/gjiiGdU/magic_kingdom_castle_hotel_price.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404113/normal_5ffa7a88a8520.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vamanufa.rf.gd/spanish_to_english_common_words.pdfIn PDF document text
    • http://nixozokusujuku.epizy.com/98178557656.pdfIn PDF document text
    • http://fosixokosed.rf.gd/photoshop_3d_text_effects_styles_free.pdfIn PDF document text
    • http://tunivepusage.epizy.com/alter_ego_french_a1_answer_key.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_off0000f6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DD 5448 bytes
SHA-256: 1baa7d80cbbd503c861d7fe979c9198f142072a5b01c374fc93c85d582dcef6f
font_01_sfnt_off00010960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10960 10868 bytes
SHA-256: f42105f238e0783dd87033bbba34998ea5c6f63abf8a4d5d99b8eb3ef1e652d7

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