Malicious PDF — malware analysis report

Static analysis result for SHA-256 d07816e32c33a47e…

MALICIOUS

PDF

85.1 KB Created: 2021-05-18 08:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c31ddfd9caeccc766279708d6f4a72e SHA-1: 10c5e0349f3fd8ba87b28dfc191f4447e4909ae5 SHA-256: d07816e32c33a47ec065b92582effe96cfdbded4fe608de42afbeafee33ada10
126 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with a primary focus on directing the user to 'xezojetit.ru'. This behavior, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure the malicious intent by using numerous disposable hosts and UTM parameters. No scripts were extracted, but the overall structure points to a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://xezojetit.ru/strik?utm_term=what+is+a+5+point+grading+scale
    • https://cdn-cms.f-static.net/uploads/4389601/normal_603b41165012a.pdf
    • https://gigufeti.weebly.com/uploads/1/3/4/6/134633464/2086bd8ee832.pdf
    • https://gekojufoj.weebly.com/uploads/1/3/4/4/134438070/sobunev-zosadasukeg-vikepemuzitili.pdf
    • https://cdn-cms.f-static.net/uploads/4466689/normal_606c1b36a3af9.pdf
    • https://fovofenat.weebly.com/uploads/1/3/4/4/134489119/naratakuziwobinuz.pdf
    • http://rijalebegag.iblogger.org/escritos_politicos_benjamin_constant.pdf
    • https://static.s123-cdn-static.com/uploads/4385631/normal_5fc57506d2c73.pdf
    • https://cdn-cms.f-static.net/uploads/4367925/normal_603f3bb23199b.pdf
    • https://cdn-cms.f-static.net/uploads/4416802/normal_60391b28ec7fc.pdf
    • https://mirezavofuju.weebly.com/uploads/1/3/4/8/134870541/bugodi.pdf
    • https://cdn-cms.f-static.net/uploads/4367645/normal_601cb13933fa1.pdf
    • http://susasami.22web.org/autocad_to_converter_online_free.pdf
    • https://cdn-cms.f-static.net/uploads/4375355/normal_5fd254435c3af.pdf
    • http://labanom.22web.org/96266649198.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bibobega.epizy.com/xogibobuzegewakaze.pdf
    • https://uploads.strikinglycdn.com/files/51a526d6-b7a4-41c4-b7d6-815f5f3157be/engineering_program_manager_interview_questions_apple.pdf
    • https://uploads.strikinglycdn.com/files/c98e1262-da5b-4374-8504-2537457964da/how_to_use_microsoft_onenote_for_business.pdf
    • https://uploads.strikinglycdn.com/files/26392576-989b-42d0-ad20-c128fe2846a8/1994_honda_accord_engine_options.pdf
    • http://vopuzed.rf.gd/49853880471.pdf
    • https://uploads.strikinglycdn.com/files/6902a5ef-39a9-42cf-ad98-80d9d67ae2ff/zazotenufudopixotumo.pdf
    • https://uploads.strikinglycdn.com/files/74955623-7a12-4b51-b0ab-6b2364727626/continuum_mechanics_for_engineers_3rd_edition.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_off00010ebf.bin
3a2f0ae0d5311ad123cd1e25a8a9cb8e8f1091bea1d843d85a2434016658babf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBF 5472 bytes
font_01_sfnt_off00012160.bin
51f1ec37c1374ade7cb56755cbd447eb240a0377b98d617fff7058fa6bb17ce4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12160 11048 bytes

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