Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9cb88e796bf4722…

MALICIOUS

PDF

111.5 KB Created: 2020-12-23 22:59:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b5c58057f40702705e48a6547f5b601e SHA-1: cb25d52fb2bf47f3d0b46929b42d817ac16511b8 SHA-256: a9cb88e796bf4722f251367904ff2c6f9e0989e6745e216143a20a545fa2524b
156 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 0.9998

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 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.
  • 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://trafffe.ru/aws?utm_term=libro+de+aprendizajes+clave+educacion+fisica+pdf PDF link annotation
    • https://cdn.sqhk.co/dowufagit/VRihG9m/rivuwadu.pdfIn PDF document text
    • https://vepawedisekonok.weebly.com/uploads/1/3/4/9/134900222/kanej.pdfIn PDF document text
    • https://cdn.sqhk.co/dijobika/OSixhfG/anger_of_stick_3_old_version.pdfIn PDF document text
    • https://xusawoji.weebly.com/uploads/1/3/0/7/130739635/365214.pdfIn PDF document text
    • https://cdn.sqhk.co/rapavuse/hiieHI8/14798087840.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/ab30bf93-549b-44da-a7a1-2c2c71514920/the_affect_theory_reader.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24b88fdf-8ca8-4468-8e7c-3e3d1bb6ee75/47727919426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c17ec7a0-8f31-4215-853f-5e07a3a17391/1501_w._badger_rd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f47ba99-6c72-4693-a087-767122ffcf98/the_paladin_prophecy_book_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1614b435-2a60-4236-8a39-2ebd4ed10c78/lady_of_the_lake_andrzej_sapkowski.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c247a4d8-82ae-4d98-9dec-d49a92ac54be/harry_potter_and_the_sorcerers_stone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b48b0b90-788f-4426-9364-7178736b4870/tepawogifutafir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5166963-d96a-4b85-b248-ecd96bcc4b01/puwataniwip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba3208b5-5532-461b-981f-7eb9d86fe300/20671935134.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_off00017669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17669 5416 bytes
SHA-256: 04038cfca84f82be3ee356e289331fa52315e845df9d2ddeae443c637bdd0e35
font_01_sfnt_off000188fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188FC 11712 bytes
SHA-256: eb58a49abf46a39fdb3fb542af03d861234b87a0edb74a6b1c9150624b83883c

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