Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac623d2098e41e7d…

MALICIOUS

PDF

70.1 KB Created: 2021-03-21 02:05:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0e1274ae65158fbc03350a36aac135bf SHA-1: 9242ba8d89f853ac648b6e2b54dab5eb542c6f82 SHA-256: ac623d2098e41e7daef83b71a2137b7e1e65fbd11ea34a6ca42b269a6d4c6bc2
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://xajibur.ru/123?utm_term=suddenlink+cable+channels+guide PDF link annotation
    • http://zesamoa.online/2021_oscar_nominations_best_picture585jn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489716/normal_602b6783d9691.pdfIn PDF document text
    • http://help-ruleviolation.com/49728508894j1cqe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375909/normal_5ffdeea3e566d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458389/normal_6039d9bfe9458.pdfIn PDF document text
    • https://zuwiwenulabir.weebly.com/uploads/1/3/1/3/131381762/52aa08034a5b46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448115/normal_6005643c2c2d8.pdfIn PDF document text
    • https://punizino.weebly.com/uploads/1/3/4/3/134327780/1764663.pdfIn PDF document text
    • http://afracheat7.xyz/mutawomawusitosopanabepqfk.pdfIn PDF document text
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/jaberigatufu-dogafa-ragitodo-buxipure.pdfIn PDF document text
    • http://cetly.xyz/bdo_failstack_calculatorf45va.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_3acdd263d99c45f09f96f8c748b617ee.pdf?index=trueIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_2d613221940b46779240b7c681cf9c3a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/ayakashi_gohan_ost.pdfIn PDF document text
    • https://22449060-8e30-4723-8828-967625cce342.filesusr.com/ugd/eddc50_4d18b5378fa64a9f8d8b58362982ec72.pdf?index=trueIn PDF document text
    • https://dd907c4b-492b-4b4d-bf3c-9f0b7a2bd2c7.filesusr.com/ugd/96a426_e0952d803a2e4eb7a160e2c7efadccc6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/building_front_elevation_software_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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD531 5412 bytes
SHA-256: 77010a6c728d3868660fb054ba91e07df979dc9b7c2b80d33ec2723cf8dd438d
font_01_sfnt_off0000e791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE791 10816 bytes
SHA-256: cac4fcb037769aab853470b03becad843a3114ad784e7842a0b856f0ad52c7c6

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