Malicious PDF — malware analysis report

Static analysis result for SHA-256 065ea04204f98412…

MALICIOUS

PDF

71.7 KB Created: 2021-04-24 04:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 29081fc4c763fdc4bc27a7d8d7b7e41a SHA-1: 511f7736af3111c004c6d6312d5f62adaa8aef28 SHA-256: 065ea04204f984127864fd1f592ef25f1decfcf4e801d378b70db478196e6c96
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://dafemum.ru/strik?utm_term=brother+dcp+7065dn+toner+reset PDF link annotation
    • http://opticsystem.website/zumalz4d02.pdfIn PDF document text
    • http://glawerry.online/development_through_the_lifespanglh8k.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/f1a87650-c37f-4c83-add7-350281fc328f/13276067189.pdfIn PDF document text
    • https://b0cee159-9ce3-47d2-9452-de9e383f1b6b.filesusr.com/ugd/fac5c7_13aabcdadd32411cb19ea90e608ee818.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/cghs_card_renewal_form_online.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/how_to_see_orions_belt.pdfIn PDF document text
    • https://19eae752-0dc2-40b2-988a-3ead9c543f91.filesusr.com/ugd/dee0a8_f7f0efdcdcc241cda5ab6e6cce5a313c.pdf?index=trueIn PDF document text
    • https://c18d9829-3add-4afa-bc87-35007fe3998a.filesusr.com/ugd/70c1ec_61a6c9dc89064ca08676855e4bb978d4.pdf?index=trueIn PDF document text
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_b68247e5dde74046b003bed7d4a6d6b7.pdf?index=trueIn PDF document text
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_6d4be082f14241beb8badf35cda94d95.pdf?index=trueIn PDF document text
    • https://66c7139a-03c0-45fe-98d3-e817d1e01442.filesusr.com/ugd/de2db5_5233502a48aa4474a3efcdae921682df.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/mipekijituxoxexep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/534552bb-2abc-4067-9ac3-134504a62491/56813369227.pdfIn PDF document text
    • https://04650017-3ca5-4b28-9d9b-11da2816551d.filesusr.com/ugd/aa03de_47065d0cf52c4539ae6997476ded580f.pdf?index=trueIn PDF document text
    • https://95e354e6-8561-4e52-807b-deb85f3b5fdd.filesusr.com/ugd/ca9b0a_73ff5639d3864cbd8774ce69664347d0.pdf?index=trueIn PDF document text
    • https://78fc25e8-d533-4ec3-a480-3617e8cc0d4b.filesusr.com/ugd/aa5866_04b580c8d0894517a7942ee27c1104fe.pdf?index=trueIn PDF document text
    • https://6448a590-b571-4b71-a9e4-820b8531b153.filesusr.com/ugd/782be2_a171ffd86f9f4c0899bbfa3a027f91c4.pdf?index=trueIn 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_off0000d8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FC 5468 bytes
SHA-256: 96b308f14af08b0a58b951cc0fd16152faf8f0e46a176f11598ac81e6510d617
font_01_sfnt_off0000eb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9D 11528 bytes
SHA-256: bb91bfa94a3a9121349457769f4c7021366d56efaa3bf7ef827e23d6d662ff31

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