Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d26d0296b19508f…

MALICIOUS

PDF

76.4 KB Created: 2021-03-30 16:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9c9c49c7c8b8c5037441ad8e4f02a2c1 SHA-1: 19e3fd1bed7269a5f4200c4e1ad31d03946df7e5 SHA-256: 8d26d0296b19508f5e565ec1611d2fb45515d62662eecc235bfe6ee481128517
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 0.9998

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://botokaw.ru/aws?utm_term=this+is+a+book+demetri+martin+review PDF link annotation
    • http://ctuxuu.com/tecumseh_engine_numbers_locationrt75r.pdfIn PDF document text
    • https://finedogu.weebly.com/uploads/1/3/4/7/134749629/tuwopifoka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418184/normal_60320471a45e3.pdfIn PDF document text
    • http://tortomsk.ru/linanizok3op0.pdfIn PDF document text
    • https://mupasifuv.weebly.com/uploads/1/3/2/6/132680827/pubobitibal-dotaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459479/normal_600dc563c9406.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e19809cf-df80-48c1-9975-8599b001ad7a.filesusr.com/ugd/062cdf_b832203b0cc5415da42bfe59487d47d1.pdf?index=trueIn PDF document text
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_de6b3b5c1e874f118dd5e21a76357c38.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/859378e9-3549-4a5f-9244-aee59058705d/lazarillo_de_tormes_adaptado_vicens_vives.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be6028dc-dc4b-48d2-920c-b1d7d7e0611f/77896952416.pdfIn PDF document text
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_91233563c94a4becb6028b309b65d320.pdf?index=trueIn PDF document text
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_007a64e63a454920bf44348e5cbf9cff.pdf?index=trueIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_a84154c1a79c4131ac997ecd790ccf07.pdf?index=trueIn PDF document text
    • https://b1f0a730-f0e4-4bcf-918d-a915077b90d0.filesusr.com/ugd/a7c69d_92e62014f7784b71856f9a9df9de6936.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c69e4219-c083-426f-b511-baf6f91f8e83/97004288974.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_off0000e9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FE 5340 bytes
SHA-256: 5afe8bb59f6cca575c12a5dc730e5c4cb65ece0d213c019aa8cf7164489e8ef7
font_01_sfnt_off0000fc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC09 11464 bytes
SHA-256: 101d48f8b9469659be44d9c1999579a593a1f4357b37cd15bab133adc25095a7

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