Malicious PDF — malware analysis report

Static analysis result for SHA-256 b368cf623af1c47b…

MALICIOUS

PDF

75.8 KB Created: 2021-03-04 20:18:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 7ebcb1009b06747498311fa052e3206c SHA-1: b964dd7ceacd0aa8b408974e4779bc539950aade SHA-256: b368cf623af1c47b32fedac49801ef1109c6d62b120e09819fa78a6cd253570a
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest it may be used to redirect users to phishing sites or download further malicious content.

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://seumenha.ru/wix?keyword=economics+personal+finance+study+guide PDF link annotation
    • http://7evenrp.ru/does_american_netflix_have_marley_and_me831nh.pdfIn PDF document text
    • https://cdn.sqhk.co/zezetemirag/ijjiaGD/gejidoluziwo.pdfIn PDF document text
    • http://familyit.info/71373708301y417h.pdfIn PDF document text
    • http://raisinshub.club/solubility-temperature_graphs_worksheet_answersie57o.pdfIn PDF document text
    • https://cdn.sqhk.co/rokajoten/gjigXHF/tukedofexalexokefow.pdfIn PDF document text
    • https://cdn.sqhk.co/kolazapikib/hZ5lidI/best_country_songs_60_70_80.pdfIn PDF document text
    • https://cdn.sqhk.co/kavuluxaja/nujiEhf/77438877679.pdfIn PDF document text
    • http://mikrotikwizard.com/83414277653eb6ys.pdfIn PDF document text
    • https://zetapowopes.weebly.com/uploads/1/3/0/8/130813904/faxotedevumot.pdfIn PDF document text
    • https://vekoduxiboba.weebly.com/uploads/1/3/1/3/131398498/fexeburased.pdfIn PDF document text
    • http://praktika-ingenieur.com/zarujiregijusut0nzpq.pdfIn PDF document text
    • https://cdn.sqhk.co/desixurate/fMheAic/radio_romania_actualitati_online_pe_telefon.pdfIn PDF document text
    • http://probkin34.xyz/cartoon_movies_dual_audio_300mbvj84h.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/chhewVC/police_cop_simulator_gang_war_hack_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/puwukuwos/QH7hbgg/balance_bmx_bikes_for_sale_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/jdhievt/human_crossword_puzzle_clue.pdfIn PDF document text
    • https://jedopebo.weebly.com/uploads/1/3/4/8/134889916/2345376.pdfIn PDF document text
    • http://reduslim-sito.site/sijigitijumuxenapenevgcpht.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/db999f24-af83-40c8-86fc-1439f7c2e257/what_is_the_average_salary_of_a_process_engineer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e3ecc3d-38a7-4ffa-a25d-e033bfee7692/the_alchemist_paulo_coelho_chapter_summary.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_off0000e138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE138 5532 bytes
SHA-256: 05a2fbff9566190f3bf1fd42f76e447cf1041297dc04398c8e49f4a43b92370f
font_01_sfnt_off0000f404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF404 14556 bytes
SHA-256: b239dcd09be71ab2613e840704d6e95213bb3b164e3900c64a9b333004a9d687

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