Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66b4c288f83767d…

MALICIOUS

PDF

82.8 KB Created: 2021-05-13 10:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 79379df7262ae6382e9ec17e18c7a8c9 SHA-1: d640344872fa96ce2280e2875849d82ab31ed61a SHA-256: f66b4c288f83767df52d5365beaac5f4e493b03187e3e7b7dc0a87a4c6430742
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains embedded URLs and is flagged by multiple heuristics as malicious, including a specific ClamAV detection for 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, suggests a lure related to resetting a Logitech mouse, which is likely a pretext to direct the user to a malicious URL. The presence of numerous external URIs and link farm characteristics further support a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://seumenha.ru/strik?utm_term=how+do+i+reset+my+logitech+m325+wireless+mouse PDF link annotation
    • https://serarabasujuz.weebly.com/uploads/1/3/1/6/131606617/c9a4c52342.pdfIn PDF document text
    • https://rivepolimuf.weebly.com/uploads/1/3/0/8/130813401/puzeketeg-wirawisisanil-dotonakavabu-nuzekov.pdfIn PDF document text
    • http://bobutukaboxavaj.iblogger.org/50788288274.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447915/normal_5feb03c2edc4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408704/normal_603b9d3849f06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421788/normal_605f57229a6bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475874/normal_60651bb57634c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495244/normal_6068be68082ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493597/normal_6003d32fea024.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469836/normal_5ffae90cf323b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471690/normal_5fd0fbe03574c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481527/normal_6041ac98be8e4.pdfIn PDF document text
    • https://gobodukigibab.weebly.com/uploads/1/3/1/8/131856162/kifege.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://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_75d528eed0974c7981cc5269b6c16676.pdf?index=trueIn PDF document text
    • http://kupobazixivev.rf.gd/bhutanese_boedra_song.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/97180969534.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/copic_marker_colour_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/3229389006.pdfIn PDF document text
    • http://xiwaresijo.epizy.com/knock_knock_film_parents_guide.pdfIn PDF document text
    • http://lupuwusi.epizy.com/23723450301.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/76045296757.pdfIn PDF document text
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_f8b49cccdbac453090b0df5b0ba116ed.pdf?index=trueIn 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_off0000efb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 5492 bytes
SHA-256: 319cf7cca906c5bf37e0a874b406e1c98f999e0fe5180dc9a0f4da21cf37156d
font_01_sfnt_off0001028c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028C 14100 bytes
SHA-256: fcae37f38aa59ef5dd1ebcaa9819862b0380a5282d0f36a019525cdac010e8e1
font_02_sfnt_off00012fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC5 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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