Malicious PDF — malware analysis report

Static analysis result for SHA-256 316b676d19bbdc09…

MALICIOUS

PDF

74.2 KB Created: 2021-02-27 11:54:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d14975a460cebaca4dc167d779f1f824 SHA-1: 9f86bc8da2de39bdea3eb9997a84b6b0f31cd096 SHA-256: 316b676d19bbdc094997a3dbfb580852a16205c29c56dc135d511aef759a23f8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://mezovuduw.ru/aws?utm_term=kenmore+sewing+machine+needle+color+chart PDF link annotation
    • http://goladelexugezi.sportsontheweb.net/82828812478.pdfIn PDF document text
    • http://gemofesane.medianewsonline.com/cessna_182_parts_catalog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460449/normal_5fc951cf8cae9.pdfIn PDF document text
    • http://gayerkan.com/93452535514yx9ry.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/the_youngest_doll_summary_sparknotes.pdfIn PDF document text
    • http://gerisekazaleg.22web.org/96519904431.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466151/normal_5fcf40ec88608.pdfIn PDF document text
    • http://fanutoragozogow.sportsontheweb.net/dungeons_and_dragons_books_barnes_and_noble.pdfIn PDF document text
    • https://cdn.sqhk.co/nixivezez/iejbBif/instachat_instagram_messenger.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pevipitoz.atwebpages.com/67509963861.pdfIn PDF document text
    • http://wolobugoxew.myartsonline.com/how_to_find_the_common_ratio_of_a_geometric_sequence_fractions.pdfIn PDF document text
    • http://zikoliduxa.atwebpages.com/fujafudefaxugigav.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_off0000e584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE584 5416 bytes
SHA-256: 67e8a6154f7ed7d08bb4c1cb3c75397f8f2876afc49b1146daa9644da06f6156
font_01_sfnt_off0000f7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D5 10652 bytes
SHA-256: 363992be270ba0d06b73b3af47cc54b34e08c181b08dc51238dd7fad165e0e2f

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