Malicious PDF — malware analysis report

Static analysis result for SHA-256 6131d312e6df81ed…

MALICIOUS

PDF

67.3 KB Created: 2021-06-12 22:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e12d786daec55ce4bdcf1df85d7ced7c SHA-1: 6ebabf19898206b6dca817730475888c17d47877 SHA-256: 6131d312e6df81ed8efd0b5b16100aaedc98597147737000de4b20b12af9e4b9
186 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 hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/pbw?utm_term=mhw+health+regen+augmentation
    • https://nenizipefofobi.weebly.com/uploads/1/3/4/3/134337801/jodat-vovowededori-ravadu-bojatop.pdf
    • https://bipekafus.weebly.com/uploads/1/3/0/7/130776646/0b01a.pdf
    • https://zizuralozirufu.weebly.com/uploads/1/3/1/4/131483034/sipepuvavap-wajakiwoxizari-bugarerajid-bokajipu.pdf
    • https://nererudufujodu.weebly.com/uploads/1/3/4/3/134321338/ea59ee80a3293b.pdf
    • https://cdn-cms.f-static.net/uploads/4380883/normal_600a76383acb2.pdf
    • https://cdn-cms.f-static.net/uploads/4482413/normal_5fd78b4064df5.pdf
    • https://detabifaf.weebly.com/uploads/1/3/1/4/131436978/9643333.pdf
    • https://vasinurevesodux.weebly.com/uploads/1/3/4/6/134605286/8ca795.pdf
    • https://cdn-cms.f-static.net/uploads/4370740/normal_606a5f19a916c.pdf
    • https://cdn-cms.f-static.net/uploads/4386086/normal_5fe6e16bb85dc.pdf
    • https://xeludopoveju.weebly.com/uploads/1/3/4/5/134528604/vudosiluja.pdf
    • https://vimijalubatek.weebly.com/uploads/1/3/4/7/134739875/xoledinaf-gudunamibepiw-gofuwotaf-waxekuf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7eefe856-5f20-4ed9-9bcf-83a13fc64161/22268376021.pdf
    • http://sijomirurefi.pbworks.com/w/file/fetch/144461334/monsters_inc_university_google_docs.pdf
    • http://zanopadik.pbworks.com/f/sieve_analysis_test_report.pdf
    • https://uploads.strikinglycdn.com/files/74b419d9-b8fd-46fe-82d8-d55157c9e3bc/how_to_make_a_storage_house_in_minecraft.pdf
    • http://ximusutoj.pbworks.com/w/file/fetch/144697887/subuzaxeridavoxatomiju.pdf
    • https://uploads.strikinglycdn.com/files/52fd1364-7272-486d-81d4-3ccdaad97ec1/19747755382.pdf
    • https://uploads.strikinglycdn.com/files/2904ef71-91af-4073-a55b-48a539707334/39215774963.pdf
    • http://fudotedafeji.pbworks.com/f/how_to_download_netflix_on_ipad_with_ios_9.3.5.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_off0000cbdc.bin
ecd6d72e4aa61e4ab67bd75676be2f660cc4638d91ee0012cbf6c559b210ae40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDC 5016 bytes
font_01_sfnt_off0000dcde.bin
8bc63c6683672b510ab45ef44321aef5272b870199b9233176c9550e17aa245d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDE 10420 bytes

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