Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf1bef281028e8a…

MALICIOUS

PDF

112.7 KB Created: 2021-02-23 12:54:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 76658dbfa708b7306aefc6f0dfeb912e SHA-1: 97e92e4371abc63d1e84879d154975fe30af5630 SHA-256: abf1bef281028e8a516a14228c4cf77ec8bedf1baed3a1dc4af012bc06b1c20b
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 0.9992

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://seumenha.ru/wix?keyword=american+gods+book+pdf PDF link annotation
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/tiwefigadabodibi.pdfIn PDF document text
    • https://mazaxijav.weebly.com/uploads/1/3/4/4/134488449/pigiwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384160/normal_6012de555d589.pdfIn PDF document text
    • http://chempion.coffee/435648796730t5we.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366371/normal_6026b8ceeee03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404745/normal_5ff4ad080d640.pdfIn PDF document text
    • http://rcasino.info/ways_of_seeing_john_berger_espaol2t8v0.pdfIn PDF document text
    • https://paratokoke.weebly.com/uploads/1/3/0/7/130739311/207a810441.pdfIn PDF document text
    • https://lewebivaduxug.weebly.com/uploads/1/3/5/3/135392118/vojelazekadara.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/35708646839.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/53684754103.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/swot_matrix_template_free.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13382 6884 bytes
SHA-256: 787cffaef6a0ea95db6dbcd039fb88acec6bb7d00c6b2bacf27b1148089a06ce
font_01_sfnt_off00014b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B43 5636 bytes
SHA-256: 4889f3386b9444025a9fd905f52d7bd60a8a27641ee0fecd735fe64c70c8ea8d
font_02_sfnt_off00015e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E4A 7632 bytes
SHA-256: 1a76b5ee27cfca57617441b6ea502c5df196b8e185b5fdc95d18fba07b76a1f7
font_03_sfnt_off00017353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17353 11648 bytes
SHA-256: 25a2bd9de1593a35fea175f5710687ae639c59c3cf3fa315b2ea158b3acc1c1c
font_04_sfnt_off00019b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B37 17176 bytes
SHA-256: 9a53d0da6d6cdbd10e88a774a06c4ee912b2d8a53651b4428de04afaee702dd9

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