Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a9263bb620d737…

MALICIOUS

PDF

82.4 KB Created: 2021-01-02 10:45:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: da2f067b5ebef45d9ad00987379f709b SHA-1: 96146bdef5c7a8c40dc0b3c2d551391a15c344b9 SHA-256: a4a9263bb620d73761c7c4e4309cfea12f76c17dee759fbf8141716826e8666e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

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://traffset.ru/123?utm_term=mendeley+vs+zotero+vs+citavi PDF link annotation
    • https://nevofegef.weebly.com/uploads/1/3/4/8/134851200/2520686.pdfIn PDF document text
    • https://wofigazidiw.weebly.com/uploads/1/3/1/4/131437722/wodunepatuxewu.pdfIn PDF document text
    • https://cdn.sqhk.co/miwiwefe/mNja3he/13855781228.pdfIn PDF document text
    • https://xenapake.weebly.com/uploads/1/3/4/3/134353424/gomejaxaxuwopiburixa.pdfIn PDF document text
    • https://bujasosepamus.weebly.com/uploads/1/3/4/6/134626994/6c81582bc.pdfIn PDF document text
    • https://xisuludibu.weebly.com/uploads/1/3/5/3/135300694/7887443.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/24e45b27-aed9-44c7-985a-c47080a5a05a/bella_6_qt_pressure_cooker_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37885ea9-9eb5-4fa9-89a6-f730c9bd5d13/minecraft_steve_smash_bros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f7e31ef-e084-4b61-ac1f-0918e68671dd/37802752550.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50254e7e-c6b1-48da-9547-3c1dcebada5b/the_scarlet_ibis_test.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/cbse_re_compartment_form_2020_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5de90d0-e70f-4bd1-b4df-f0a9505a2047/58385862256.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_off00010373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10373 5148 bytes
SHA-256: f9d307e212f9d0874b7c28e8a3feb49a0245f8f5f385f4dd1c7659a658e34ce1
font_01_sfnt_off00011525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11525 11968 bytes
SHA-256: 6f008b91c88250ea9f6a0487a146c9c757cf72107b5a26ebc7b90b5ae54843fd

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