Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd85c6a136d7822…

MALICIOUS

PDF

79.7 KB Created: 2021-03-17 10:55:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a2343b49f6cbf443cb4ae9b9b14f956 SHA-1: 1e82a9bf3ef687ef83bc98d0fd7a3ad6f2e9d5dd SHA-256: 9bd85c6a136d7822e62ed7eef2481dabd86ca52fe725059cd9043464852b74cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which are to obscure domains and are likely part of a link farm designed to deceive users. The heuristic 'PDF_SEO_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly indicate a phishing or malicious intent. While no scripts were explicitly extracted, the nature of the link farm suggests the document is intended to redirect users to malicious content, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/wix?keyword=formatos+de+produccion+en+excel
    • https://zoditivifu.weebly.com/uploads/1/3/4/3/134316547/3477425.pdf
    • https://cdn.sqhk.co/mupalewefe/hhEibie/intarsia_woodworking_for_beginners.pdf
    • https://kusejibetejoxer.weebly.com/uploads/1/3/4/7/134749151/sanamivedivaf.pdf
    • https://cdn-cms.f-static.net/uploads/4454808/normal_603f99c563bff.pdf
    • https://cdn.sqhk.co/fegujajox/GjdDhaa/jodolorubonebopovu.pdf
    • https://static.s123-cdn-static.com/uploads/4390371/normal_5feb64e11d93f.pdf
    • https://cdn.sqhk.co/fenozidu/mjfggYn/38380921061.pdf
    • https://dajidavibaral.weebly.com/uploads/1/3/4/6/134606929/zuwonezaguwukaxadi.pdf
    • https://cdn.sqhk.co/medujebukoma/dmDjaMo/willow_tree_my_new_baby_blush_figurine.pdf
    • https://cdn-cms.f-static.net/uploads/4366340/normal_6030ed193ff4b.pdf
    • https://cdn.sqhk.co/xanovixewin/aii5ge0/dozunulaloleledibetaden.pdf
    • https://cdn.sqhk.co/riwajamugem/R3jImpf/11746609617.pdf
    • https://jabevemejo.weebly.com/uploads/1/3/1/4/131483275/lajolekas-tuxolowi.pdf
    • https://cdn.sqhk.co/sofawaju/hcehcvR/53247443162.pdf
    • https://cdn.sqhk.co/sogunixe/37ihjbD/45089327887.pdf
    • https://cdn.sqhk.co/paxajirawegu/yeiiekE/4890982775.pdf
    • https://cdn.sqhk.co/jujuziwe/xNwggjd/directions_english_worksheet.pdf
    • https://cdn.sqhk.co/javukapegami/ikib7jg/application_support_mobilesync_mac.pdf
    • https://cdn.sqhk.co/fanekizesedi/ihhdufT/ground_operations_development.pdf
    • https://cdn-cms.f-static.net/uploads/4475196/normal_6032c762af8e1.pdf
    • https://static.s123-cdn-static.com/uploads/4371010/normal_5ff2783b1a53c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/be3e49c1-d549-4300-a1c1-71ac01e203a4/89259273806.pdf
    • https://uploads.strikinglycdn.com/files/ef2b5067-67ec-4320-a85d-5015ed9f7b7d/why_has_my_beko_oven_stopped_working.pdf
    • https://uploads.strikinglycdn.com/files/7931db27-ac3c-4654-9684-7c33890ac1e6/fiwevavigekule.pdf
    • https://uploads.strikinglycdn.com/files/fd6cd4e1-0fbb-4cb8-92d4-af991dc0f596/71610902255.pdf
    • https://uploads.strikinglycdn.com/files/3a7bb714-5063-4d7c-939d-f4f622574fda/zikilofapofoz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f756.bin
8f0cb11e4ffc867c2fcfc0cfacf54c597afaa21ccc35386e8aa74d7970380404		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF756 5240 bytes
font_01_sfnt_off00010914.bin
468b29036dd2bbf83d466a2918a154acaa127c892e5387e184d848c690fed1c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10914 11696 bytes

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