Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd2c31d3e1545e51…

MALICIOUS

PDF

81.0 KB Created: 2021-03-14 15:13:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 46cb98422bb9ee472768945122cb273e SHA-1: a1ed2114ae58228e13e134c6e63581e0545b8981 SHA-256: fd2c31d3e1545e51a6c11fed3779dc5bd67119bf3937558cd797273378cb75ab
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it functions as a link farm, potentially for SEO manipulation or to distribute further malicious content. The presence of external URIs and the overall structure point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/award?keyword=airway+assessment+anesthesia+pdf PDF link annotation
    • http://vijevejumozugim.sportsontheweb.net/nerumogajemikekanijeba.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/regufojalojaza/what_are_the_best_raw_foods_to_eat.pdfIn PDF document text
    • http://tovujopojat.epizy.com/no_answers_lyrics.pdfIn PDF document text
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_e9323c3935f341b892833ffe2acb9ffe.pdf?index=trueIn PDF document text
    • http://tefetuzuzip.myartsonline.com/dr_jekyll_and_mr_hyde_book_free_download.pdfIn PDF document text
    • http://titarejidawe.epizy.com/56791365403.pdfIn PDF document text
    • https://4a7d9d2b-1d67-446c-8d6d-bdd3043d1f60.filesusr.com/ugd/c3d078_31bd898b151c488bba3ee3cbe275943a.pdf?index=trueIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_ea4bf80024e441e29da9661f05f72077.pdf?index=trueIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_cd78aeb6928447ff98dfaa04915f8cb3.pdf?index=trueIn PDF document text
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_b0b07c34110a4fcc9f0d47f7e3b9b598.pdf?index=trueIn PDF document text
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_8780463914e54331a3d2ea2ceb48944b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lukepepe/capitulo_1b_repaso_crossword_puzzle_answers.pdfIn PDF document text
    • https://f77c8dad-41d7-4a8f-8d8d-c05149a3a236.filesusr.com/ugd/36d413_466a980a2cb04971a906f67e5cd36e61.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wolawatin/67390013511.pdfIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_b5ae6c46a0ae43b297bdddbe39a732c3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fatisake/high_density_polyethylene_sheets_calgary.pdfIn PDF document text
    • https://0443db59-9f9d-4031-b786-8a5723798135.filesusr.com/ugd/ab62d6_8253530d37504e49a9f875343d5277b3.pdf?index=trueIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_0d7769b2c9de48e1906af6e622a5763b.pdf?index=trueIn PDF document text
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_54c4d9d864ca48c5bd6f82944b54b3e5.pdf?index=trueIn PDF document text
    • https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_eabfde20e06141e6bc479f17c0415424.pdf?index=trueIn PDF document text
    • https://fb9345b8-40be-4608-a8ff-9c5427dba92f.filesusr.com/ugd/98d639_71c0dc2c56e54609aa35f18e6227529e.pdf?index=trueIn PDF document text
    • http://zekarevuwo.epizy.com/entropy_in_information_theory_define.pdfIn 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_off0000ff7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7D 5432 bytes
SHA-256: 01ba754bf92ef64f3d3c8514096636b03a32f77a57b33ffd8c997c67af8bcb35
font_01_sfnt_off000111e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E5 10736 bytes
SHA-256: 8b9fc26786a94be9fdd749c6b3f362245b64e83f3507c2bb6a18a525e5a54a30

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