Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa34a3861f70654…

MALICIOUS

PDF

74.9 KB Created: 2021-03-17 18:53:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e295bdd1baa7fc71ef361111c4bf5eec SHA-1: 92dfe6e13627fe9a828e4d49c63c46f14965ed01 SHA-256: aaa34a3861f70654ca7b256fdc7371909235409373b4dd65c28dd41a062b21a7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely used as a lure for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/strik?utm_term=is+thinkorswim+delayed PDF link annotation
    • http://fosireditoj.mygamesonline.org/new_living_translation_bible_free_download_for_pc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408996/normal_5fed6ef54ab42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480393/normal_5fca07d751de9.pdfIn PDF document text
    • http://parazepurafeza.medianewsonline.com/31283131034.pdfIn PDF document text
    • http://steelsho3.club/strategic_marketing_planning_slidesharexip32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446394/normal_5fcdcbd92df49.pdfIn PDF document text
    • http://livecopyrightverification.com/maytag_bravos_mct_washer_error_code_sdv80f9.pdfIn PDF document text
    • http://lofitner.buzz/daxiwinikadarusetedor05yqy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367013/normal_6040ad921bd7e.pdfIn PDF document text
    • http://sovetnik53.ru/maxapuwovit46kpi.pdfIn PDF document text
    • http://gusitolife.iblogger.org/how_to_write_an_essay_structure_in_english.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_463195bc057d44189cdb8e677bc04108.pdf?index=trueIn PDF document text
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_0f2485cbb1dc45e8a2983306569da33b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/zirupituku.pdfIn PDF document text
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_134c431342424cf99e4f3644c3bd9a6f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/98697034466.pdfIn PDF document text
    • http://marilineme.epizy.com/dasoz.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/bejeweled_3_full_version_for_pc.pdfIn PDF document text
    • http://lebusepuwiri.atwebpages.com/ferinejipovikodulesof.pdfIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_6650c180a09141ebbd27686d097ce563.pdf?index=trueIn PDF document text
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_53e04d6ad9d341c8b36433347b0f3b26.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_off0000e5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A4 5260 bytes
SHA-256: 1ecb9c774f7517cf648218533c0f3c5b64334cf9d1a3bbb72f86838ea6aed4df
font_01_sfnt_off0000f76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76D 11904 bytes
SHA-256: 283f7cfd1fc9050f10906f471d72fdd987ee0beb3dbbe9e3b90f4c96102b53a7

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