Malicious PDF — malware analysis report

Static analysis result for SHA-256 b90cb7bbaf03deed…

MALICIOUS

PDF

80.3 KB Created: 2021-05-27 06:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b971339bd279723f42c76744acee89a6 SHA-1: 7830912381c5d139e9de3d701d1f642bbddb943a SHA-256: b90cb7bbaf03deed385845e473417c1b22a22cbcf23eb64ed9d7418346711fe8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of attempts to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://resalured.ru/strik?utm_term=weslo+cadence+g-40+weight+limit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453743/normal_6022698d13ea1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444647/normal_6033c4971b079.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369928/normal_5ff93f6dcae55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480414/normal_5fd6a02290306.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450733/normal_60498c6755e44.pdfIn PDF document text
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/zewiwi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481058/normal_5fed4bd96b387.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470692/normal_6065d34702c82.pdfIn PDF document text
    • https://govotewimodiku.weebly.com/uploads/1/3/4/6/134649218/buganekima.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383308/normal_60430bf08851b.pdfIn PDF document text
    • https://tukusalo.weebly.com/uploads/1/3/0/9/130969921/52ddd650f17b5a0.pdfIn PDF document text
    • https://fevegukiso.weebly.com/uploads/1/3/1/4/131482975/1116081.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380090/normal_5fe9641f98226.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372354/normal_6059eceda4fdb.pdfIn PDF document text
    • https://fipoxojumudex.weebly.com/uploads/1/3/4/6/134649093/sopuvedomijerafereke.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/fa9486c6-01cc-4a78-a14d-54ef4ae6f131/safuwapiwutumesafejukoma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e167161e-9bae-4b7d-90e3-0a105afa9c36/the_tempest_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/974daf24-8246-4394-8a32-9d9c551e1e3a/windows_xp_professional_loader_daz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53ceda11-1bcf-497c-af0a-32da61a84925/model_3_price_drop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dad9613b-406a-4194-b7e6-59aee7b4368f/91627602614.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/609cc973-bfb5-4366-9dbd-059119a267e5/60123957682.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b1dcc46-14d1-41e8-9cf5-ca4d888e129b/what_does_base_rate_mean_in_business.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f583e6cf-b824-4afe-8f3f-d59a5f6d8d5d/dream_interpretation_dog_feces.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89ec7872-b67b-4b3b-936d-67e7cbff845d/how_to_set_timer_on_outdoor_lights.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_off0000f682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF682 5624 bytes
SHA-256: 07e2019df2a04fa7da7e62fa7e63ad6adaacecbaa93235bf10b904dc4be10dc8
font_01_sfnt_off000109a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A4 12620 bytes
SHA-256: 96b8c0d8de69ad151bbc7316dec1589e01715278f4e49a3d16d685199e28b95f

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