Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0aac34c8caa8679…

MALICIOUS

PDF

67.0 KB Created: 2021-03-14 11:41:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 38b7d8b41ded930d4812cce22d4ef3e9 SHA-1: 2c5e258ae6491e4fbda58cfae9f81e0e57793b0d SHA-256: f0aac34c8caa86799b8437a4b74423033e60cad1154a4ae70da2f706eddbfb1c
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a significant number pointing to disposable hosting and redirectors, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary malicious URL identified is zajinet.ru, which is likely used to host phishing content or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://zajinet.ru/strik?utm_term=homelite+gas+trimmer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482882/normal_603c262397719.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403262/normal_5ff264bcc32cb.pdfIn PDF document text
    • https://cdn.sqhk.co/woxemumi/wlULjbe/94392295969.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367617/normal_5fe6a91fdd817.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410002/normal_601561d8db8cd.pdfIn PDF document text
    • https://cdn.sqhk.co/wodabakope/hdidfM3/flow_phone_top_up_barbados.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488574/normal_602ac027acb74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406806/normal_60221725a0caf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417119/normal_60054bdbcb200.pdfIn PDF document text
    • https://cdn.sqhk.co/vozofugova/ja6geii/can_am_defender_hd5_problems.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417980/normal_5fdaefcaec435.pdfIn PDF document text
    • https://cdn.sqhk.co/jisogixij/ih9jdG6/dessert_recipes_using_canned_apple_pie_filling.pdfIn PDF document text
    • https://cdn.sqhk.co/sejujona/jifC6gj/36670578453.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444646/normal_5fe544023c73d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/71683539539.pdfIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_936f74cac9694f9e9311621ee8cb6497.pdf?index=trueIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_ced006299c20433ab4dcdddd18a1dc34.pdf?index=trueIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_98daee45f7ee4d739f26991076910663.pdf?index=trueIn PDF document text
    • https://6c9aa500-f8d9-42a6-b8a4-5b3c562bbfc3.filesusr.com/ugd/543886_84117197c62e40e2a289c0fc9c847da4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rumezo/present_perfect_and_past_simple_multiple_choice_exercises.pdfIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_86d09053811e4ce5b37729bb0179191a.pdf?index=trueIn PDF document text
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_ba230343fe3b4f02b0f6cf5b460b1e35.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xokebore/92066975630.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/afro_beat_drum_pattern.pdfIn PDF document text
    • https://45f0f727-c607-4398-b3b7-8b42e23b21b2.filesusr.com/ugd/0a84ca_05cbcc4f3bed42699723e42b2d7b34e3.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_off0000cd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD41 4968 bytes
SHA-256: 826922a503fd06a22642f41b5911a5216173179fdf9e6089efb9975aa43a85ea
font_01_sfnt_off0000de0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0A 9544 bytes
SHA-256: f9dd0b7872aa46945554a62cdb362b796ef1527d808f5ef48aaa0183010acc4b

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