Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90f26c99e784098…

MALICIOUS

PDF

76.7 KB Created: 2021-04-03 20:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f8279f5ec76012966685455287417e3c SHA-1: 28808f7e29e4bbbbdc5d89002c44be5e76e31f89 SHA-256: d90f26c99e784098b4b147fc4fba25c407694fbcc06ebecf09b3cc57be32652c
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest malicious content, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://baarspo.ru/strik?utm_term=the+american+way+of+life+abitur PDF link annotation
    • http://abwaab.su/627040333176gx1t.pdfIn PDF document text
    • http://devlp.club/why_does_my_sony_sound_bar_keep_cutting_outsqvjz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479462/normal_5ffb66d92356b.pdfIn PDF document text
    • http://help-copyrightviolationhelpcenter.com/35513018771272lm.pdfIn PDF document text
    • http://vizionsmc.net/what_is_the_most_viewed_songs_on_youtubeqww50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367914/normal_5fe991b5ed5b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448727/normal_5fec99e6dabdf.pdfIn PDF document text
    • http://ipoteka.net/miranadawebijowzfs9u.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/1f0afccd-1fda-4358-9d4b-6c9f87cb04ba/xusib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75abb765-1b85-438a-beea-eb2822f25c4f/central_and_peripheral_persuasion.pdfIn PDF document text
    • https://c5c1e25b-3ca9-4f8f-aecb-0ee3b29cb37b.filesusr.com/ugd/f4fe7b_3799e36b9b194cfa9eede4560ab62da9.pdf?index=trueIn PDF document text
    • https://0a37a3d5-a0bf-4e77-8ff5-6127fd08aefa.filesusr.com/ugd/6046c9_894c42664de04591917e79ea49878297.pdf?index=trueIn PDF document text
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_ebbf15f92f014a8d8a459873d7b9ee11.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/58cb06a8-7c5a-46bb-9653-cc4abf55959d/cogat_practice_test_2nd_grade_online_free.pdfIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_fd64373beaad44979f186be57ebe5658.pdf?index=trueIn PDF document text
    • https://d0f5cf02-e55f-42e7-ba97-8a4d5a2b8368.filesusr.com/ugd/7f59a0_f4a0fe73b4f64c7abd4befce1764240d.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_off0000ec63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC63 5228 bytes
SHA-256: 34584f5bf5a6bf9e34927f2cdd0c11976710b5cebc7c23046a1dbd5768da9c85
font_01_sfnt_off0000fe19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE19 12224 bytes
SHA-256: 9526149dcbbed1973b077af28b4ea039321404a05a3d1d734399e0c0ad80ad61

Open this report in the interactive analyzer, or submit your own file for analysis.