Malicious PDF — malware analysis report

Static analysis result for SHA-256 707f775424ac03ee…

MALICIOUS

PDF

66.4 KB Created: 2021-02-14 13:46:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f96634be62645dbaacd0d19ae349486b SHA-1: de89b84afac8629797feb9093f1f41ee0f46e856 SHA-256: 707f775424ac03eedb52c21dc60e2b412cb0fc4acb41856984d53507994a9aa7
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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/wix?keyword=awesome+planes+2+unblocked PDF link annotation
    • https://vilujelirajoki.weebly.com/uploads/1/3/4/3/134378771/pejapekona.pdfIn PDF document text
    • https://xulakuvoloja.weebly.com/uploads/1/3/0/8/130813987/6934186.pdfIn PDF document text
    • https://cdn.sqhk.co/nedupugifuka/ijhfijK/teweku.pdfIn PDF document text
    • https://pasuwuzo.weebly.com/uploads/1/3/1/4/131438486/2946380.pdfIn PDF document text
    • https://cdn.sqhk.co/fumazuri/elRnYjg/55622360817.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/iejBrbQ/29759097273.pdfIn PDF document text
    • http://svoydvalend.xyz/7866937930673oby.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxikanabu/hxd9hdc/stickman_clash_mod_apk.pdfIn PDF document text
    • http://repair-monokoles.ru/522961541436ac83.pdfIn PDF document text
    • https://sabizedikidoxar.weebly.com/uploads/1/3/2/6/132681903/69cfa4b.pdfIn PDF document text
    • http://milansit.space/775810161659b47g.pdfIn PDF document text
    • https://cdn.sqhk.co/lupekute/bxhkuy6/showbox_movie_app_for_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/closed_cell_foam_sheets_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/86497971132.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/62198629848.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/poxot.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_off0000c6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D2 5540 bytes
SHA-256: 4ab41aff549ef31be427b005c7ad78163b4263fda0cc57a3ef109c89773ce463
font_01_sfnt_off0000d9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AB 10284 bytes
SHA-256: e3a3ff9e774e158d546999aca626719ccccc91e167056bdad167bd41d44a58e1

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