Malicious PDF — malware analysis report

Static analysis result for SHA-256 19af511ca683bc6a…

MALICIOUS

PDF

73.2 KB Created: 2021-06-01 14:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 212fc741bb20c95058cf07a91d4c8958 SHA-1: 0e0eb671f81ee9b97de34e59b6f031794cc3a70c SHA-256: 19af511ca683bc6a1303ac87d782b599e3254b635c27cd288aecdfcf0a1c0a7f
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/pbw?utm_term=how+much+do+old+navy+employees+get+discounts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413370/normal_6013c08fe4978.pdfIn PDF document text
    • https://geruzusuvar.weebly.com/uploads/1/3/0/7/130776720/8841108.pdfIn PDF document text
    • https://zuwumepegowivos.weebly.com/uploads/1/3/1/0/131069935/gotuwaxuxuxus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392650/normal_6020a2917ccdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367643/normal_6027057e90748.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470688/normal_60132fc6ca40d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410002/normal_601562470ff9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368956/normal_5ff2da505e683.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479446/normal_601c9cbb9c2d8.pdfIn PDF document text
    • https://fogebutozedelig.weebly.com/uploads/1/3/0/7/130776223/sigamovipos.pdfIn PDF document text
    • https://dopakujovifoba.weebly.com/uploads/1/3/0/7/130739833/jatepemurukojudas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381297/normal_6013354f15692.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/d1ac27dc-7607-439f-89fa-90c6e6c626e9/best_sword_skill_saoif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b8ccbab-cf81-410d-8367-67e4c3887fb5/7612299141.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec6b497d-494c-4e50-a124-870da17935cb/72865081626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b240dbd-8e20-433c-aee3-fe7c55e17729/mamizid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcc7f1b5-12b5-4fe3-b0aa-b6ddfcf69dcb/how_to_use_a_samsung_microwave_convection_oven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b29fc5d-5818-466c-afc3-4bed1c675344/57551952916.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc3810a5-b32c-449c-88d0-d0520554671d/rawopubuwer.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_off0000dc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC00 5608 bytes
SHA-256: 6b2db070f87950995103fe0c0a09b0ac0366ffb8c1e8a6df7603c9c83b874ab9
font_01_sfnt_off0000ef09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF09 11304 bytes
SHA-256: b6eeebfeaba2ea068de4002fdab68be420392bf67817b75c7e3f268330e24994

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