Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a29e56811213714…

MALICIOUS

PDF

93.9 KB Created: 2021-04-07 16:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 6c7ed0b8da3e631d0c14629ef511602e SHA-1: 2e027b5f410682a5b44a0911f96695a98b87c925 SHA-256: 3a29e56811213714b0064dd3fc4ca5f0954266dba9a76505f414c369c2e9fd8c
186 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though obfuscated, appears to be a lure related to 'History of money in Brazil', likely to trick users into clicking the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=hist%25C3%25B3ria+do+dinheiro+no+brasil+wikip%25C3%25A9dia PDF link annotation
    • http://antileqphh.site/3322991406282wb8.pdfIn PDF document text
    • https://vidamizumowi.weebly.com/uploads/1/3/4/5/134598026/52ad0efb8.pdfIn PDF document text
    • http://xipuloval.iblogger.org/93568129260.pdfIn PDF document text
    • https://nebavorod.weebly.com/uploads/1/3/1/4/131406600/49a5611106e0625.pdfIn PDF document text
    • http://yewes.space/satyanarayana_biochemistry_book_free_downloadqse5p.pdfIn PDF document text
    • http://gemajelibetojup.scienceontheweb.net/12623405750.pdfIn PDF document text
    • https://suxifobafip.weebly.com/uploads/1/3/4/3/134370270/kavimelixeg.pdfIn PDF document text
    • https://jigaxokere.weebly.com/uploads/1/3/4/6/134622899/2049346.pdfIn PDF document text
    • http://pemizirevubel.mywebcommunity.org/nikon_d500_reviews_2020.pdfIn PDF document text
    • http://good-production17.site/zudazoruo9vmu.pdfIn PDF document text
    • http://nubemeketetu.mypressonline.com/97884702281.pdfIn PDF document text
    • https://pifofunota.weebly.com/uploads/1/3/0/8/130814871/b68e682ac3f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_5d0bdb6d169c4aff82099bb7cc543106.pdf?index=trueIn PDF document text
    • http://debatebarumexa.epizy.com/duwutat.pdfIn PDF document text
    • http://likifodafiduno.epizy.com/sri_rudram_meaning_in_english.pdfIn PDF document text
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_c82c723e57844f8fbef460641bb13193.pdf?index=trueIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_c8915cbf0e0e4481b0bc53052ab0b456.pdf?index=trueIn PDF document text
    • https://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_51f11bfc989d40a7ab4d493d65a6edc7.pdf?index=trueIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/celebrating_diversity_through_world_literature.pdfIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_f0a77630eaa84e508b299e19d4ed65ca.pdf?index=trueIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_02df8b9127f64b9389fca16b13f69f2d.pdf?index=trueIn PDF document text
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_ca96160840d14e5c8fb69de2633d6e3e.pdf?index=trueIn PDF document text
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_a83b9b0c884844aab07f8ef0b0ea993a.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_off00012b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B33 5584 bytes
SHA-256: 0c60518a27c9df33f6de6741b352142f474019d1d77ba20ddf77702be47e11b3
font_01_sfnt_off00013d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9D 13680 bytes
SHA-256: a0f97752d6246fea0be392ce9c8eaeb1e5564b48acef9485182e7f589486e4b6