Malicious PDF — malware analysis report

Static analysis result for SHA-256 34f22253040f5549…

MALICIOUS

PDF

78.9 KB Created: 2021-09-11 15:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1d0bc7f856e01ad93681aedb5a2d0ae1 SHA-1: 126e1e6786538d5ed54eaf8ea614488dbcb7c18a SHA-256: 34f22253040f5549113c55a45f67bbd2f8ba76bb3da216c40b2aa62dd93a33c6
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document's purpose is to act as a deceptive landing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://koratspring.com/upload/file/dolorekow.pdf In PDF document text
    • http://frangarcia.eu/upload/file/dajuvap.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/kizugulip.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/susixovidopijavojov.pdfIn PDF document text
    • http://pneusmarene.it/images/file/nijumuz.pdfIn PDF document text
    • https://ever-progress.com/upload/files/kuzimilikowutopesugilufi.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/24264858880.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/21034150682.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/pajesok.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/wofedokabadofomiginowuras.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/pezuzebe.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/nunawigunosomurutu.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eab0d2d7a2---sizomibuganugot.pdfIn PDF document text
    • http://drtamerturan.com/file/wefosakevatik.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/92021622258.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/31432465040.pdfIn PDF document text
    • http://tavio.su/files/file/82020019705.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/japanuwenolenovomefug.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/63370758769.pdfIn PDF document text
    • https://peterdegendt.be/file/wusudofoforovekegutofim.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/revabalabon.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/xisixiritepivi.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/81239535654.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/73679716776.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=financial+management+brigham+13th+edition+solution+manual+pdf+freePDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB92 11508 bytes
SHA-256: 3644205115b0fb5add40dd6e1bd90042ab361bc881eee519fca9c107f04abb32
font_01_sfnt_off0000e639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE639 17660 bytes
SHA-256: 1242fff79854b5b944ed7bc9d60a8bbccd798d7177e861c4ac4ddaa04118d5d5
font_02_sfnt_off000114e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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