Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a623e065a75eeed…

MALICIOUS

PDF

75.4 KB Created: 2021-04-03 12:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 04936ac0f95f576881d6a9ad319572af SHA-1: be5291e74c1dfe9f01eb01ada7f80e6a05d1cc89 SHA-256: 9a623e065a75eeed05d72351036fa69b930cd710df29af3c93c96436e8aadd6e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable or suspicious domains, suggesting a link farm or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://botokaw.ru/wix?keyword=excel+spreadsheet+tax+formula PDF link annotation
    • http://20970907.net/the_art_of_mackin_free_ebookyclvc.pdfIn PDF document text
    • http://particuliers-societegenerale.xyz/45007692350phv73.pdfIn PDF document text
    • http://wofaguwere.iblogger.org/fake_id_card_maker_apk_free.pdfIn PDF document text
    • http://wusapibixabupak.iblogger.org/jiselegutitiza.pdfIn PDF document text
    • http://money-team.site/cdc_zika_virus_guidelinesa7i4p.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.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/979f0a88-bb50-433a-bc92-692b7d03ec94/dispatches_michael_herr_quotes.pdfIn PDF document text
    • http://zepibugab.rf.gd/kinematics_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/358b6a7d-a21f-464e-9786-2c3c34b808f5/89051829679.pdfIn PDF document text
    • http://laxuzakefojo.epizy.com/how_to_manually_turn_on_sprinkler_system.pdfIn PDF document text
    • https://a8fdb364-3865-4521-a36b-e12f4de7752f.filesusr.com/ugd/e20637_6ff71095d256417e9266254e2eea2458.pdf?index=trueIn PDF document text
    • http://turijebudeta.rf.gd/are_dryer_sheets_bad_for_cats.pdfIn PDF document text
    • http://xidozuk.rf.gd/vapilaxewosided.pdfIn PDF document text
    • http://fivajopafovile.rf.gd/39716490755.pdfIn PDF document text
    • http://sewunenukubepan.epizy.com/26296718018.pdfIn PDF document text
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_474c7d9bc5fa4c5bab0189839f218911.pdf?index=trueIn PDF document text
    • http://selaxarizipa.rf.gd/whatsapp_new_version_for_nokia.pdfIn PDF document text
    • http://pejinubonuxus.epizy.com/sofezibafizifugimadopeli.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_off0000e67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67F 5420 bytes
SHA-256: f7514f09c00fb611867503093002d0b9413b8ecc6a8aed1f554dfe1547e6e350
font_01_sfnt_off0000f8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CB 11616 bytes
SHA-256: c0bac87903a89f2d5634ba540d0444768763ca18bfb84e4477d39d6832869ce0

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