Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba46a7223e8f973…

MALICIOUS

PDF

67.1 KB Created: 2021-04-11 10:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: acf40f89e3049ff46999037c69c3af81 SHA-1: 77e128febdd7045e76b2020468b3f8c5d75440f3 SHA-256: dba46a7223e8f973018fd190a2878cb6aba74704651788391559a73543835ff6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely for initial access via spearphishing.

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://bologen.ru/strik?utm_term=doing+better+than+ever+quotes PDF link annotation
    • https://cdn.sqhk.co/kisetofekuzi/ifjdmxg/kofeje.pdfIn PDF document text
    • https://cdn.sqhk.co/numisezopo/ibYRh18/codehs_answers_2._3._4.pdfIn PDF document text
    • https://pobozopidukav.weebly.com/uploads/1/3/4/3/134384736/zorifominesimaliki.pdfIn PDF document text
    • http://azakalaza5.xyz/sholawat_syubbanul_muslimin_addinu_lanae39bp.pdfIn PDF document text
    • https://dolunejasuvufa.weebly.com/uploads/1/3/0/7/130776008/gonoferuxamewu_megepakaxetedog.pdfIn PDF document text
    • http://mercelus.xyz/ace_commando_uptodown1laly.pdfIn PDF document text
    • https://vexibalob.weebly.com/uploads/1/3/4/8/134896466/maburapodixafenez.pdfIn PDF document text
    • http://yourbigdick.space/motorola_surfboard_sbg6580_change_channel4rvsj.pdfIn PDF document text
    • http://tevfikyuce.xyz/how_to_conduct_a_meeting_step_by_stepqnavl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482623/normal_60355c65df904.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475577/normal_5ffa09579e333.pdfIn PDF document text
    • https://lepefolavexar.weebly.com/uploads/1/3/0/8/130874674/gexawitumivezadu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369190/normal_5fc798495a513.pdfIn PDF document text
    • https://cdn.sqhk.co/ruretibot/HwSPWjc/dragon_ball_craft_games_ps4.pdfIn PDF document text
    • https://cdn.sqhk.co/buvaboda/YU4hjjj/80s_and_90s_rock_music_videos.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/jexefupesi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_ee6c97393730426da54a22ce2f99a844.pdf?index=trueIn PDF document text
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_9e7570376d9a493ca5c49b2ad628ade3.pdf?index=trueIn PDF document text
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_4a0f561c8ba648398f967aa613188bd2.pdf?index=trueIn PDF document text
    • https://6f46ab72-b8e3-4ec2-8f01-cb5d6491dab7.filesusr.com/ugd/9a120b_1a319cc5d4434e65a6d6133c8c02929c.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_off0000c915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC915 5240 bytes
SHA-256: 4360f85cba15921d9a02abadf5395a7f1da4886802ccc3a522d45cc8b14d543d
font_01_sfnt_off0000daed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAED 10116 bytes
SHA-256: 3f18e1e8999ea673a45dcb2a06a25127b6ee5bf216d98a80bbcc0080d9537473

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