Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2000b36e762a7f1…

MALICIOUS

PDF

78.8 KB Created: 2021-04-24 09:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c1db5f874d5e6fdf34a089cfabcacba5 SHA-1: 258c4935804b22d79d7c42612f2cb6f852e54e2e SHA-256: f2000b36e762a7f1b5c758a2074e0142d5dc96f1dcc6cc772496f6c228d15640
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains an external URI pointing to a suspicious domain, and a heuristic indicates it's a link farm on disposable hosting. While no scripts were extracted, the presence of external URLs and the nature of the heuristics suggest a phishing or malware distribution attempt.

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://druttle.ru/strik?utm_term=present+perfect+simple+vs+present+perfect+continuous+exercises+upper+intermediate PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4372377/normal_5ff7da98d2a5d.pdfIn PDF document text
    • http://fionainthefield.org/photoelectron_spectroscopy_pogil_answersowu55.pdfIn PDF document text
    • http://jumbochecker.com/72302290149wmarm.pdfIn PDF document text
    • http://jenalosi.iblogger.org/1175335750.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371020/normal_6057afc4b5d70.pdfIn PDF document text
    • http://vujivozopix.iblogger.org/8555770581.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388156/normal_5fe6419e2f297.pdfIn PDF document text
    • http://power-guard.shop/temel_karakalem_derslerietkw3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415519/normal_5fe2931938a6b.pdfIn PDF document text
    • http://samelike.site/45269584068lpxuu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385859/normal_6030e85dba496.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zotubetujuna.rf.gd/voviporitulalalomefav.pdfIn PDF document text
    • http://badiwofotafazol.epizy.com/cabinet_of_curiosities_book.pdfIn PDF document text
    • https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_ed805a210afb4ed886b8a31ef9f1d6af.pdf?index=trueIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_8675f24264d54ecc92f6524487387899.pdf?index=trueIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_fb9862f91cc24a798132887fe4ed3f19.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d40f9191-034e-4b35-b0be-2d9defb4dd39/34856517119.pdfIn PDF document text
    • https://s3.amazonaws.com/gopifu/hospitality_management_exam_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73eafc62-4ac0-4612-8009-72e99347e84a/should_you_keep_clothes_that_dont_fit.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/14636566267.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE732 5312 bytes
SHA-256: 193edad97bc1a4e46515f48eb0763ca321ab99b47f9accac87b4c7ab15e05b2b
font_01_sfnt_off0000f926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF926 11048 bytes
SHA-256: aad975e3a70d670d0336a4d23f78ff5a8aad97b962fd745cdb3984f84970f389
font_02_sfnt_off00011ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECD 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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