Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe812205aa89a174…

MALICIOUS

PDF

80.3 KB Created: 2021-03-24 17:58:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c05ea305be233deb3acfaca345607570 SHA-1: 9f423161f91f041a22684c5a44e8984b976f0619 SHA-256: fe812205aa89a1748742bebf07c6e29faea0602414bb4cbd2768b0b4e78e802e
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, characteristic of a link farm or phishing campaign. The document body, though heavily obfuscated, suggests a lure related to 'organic chemistry conversions'. The presence of multiple external URIs and a high ML classifier score indicate malicious intent. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/aws?utm_term=how+to+do+conversions+in+organic+chemistry
    • https://cdn.sqhk.co/xonipavu/hii3NFJ/45511669670.pdf
    • http://pirojibanenuzi.getenjoyment.net/treatise_cornelius_cardew.pdf
    • http://zemesod.getenjoyment.net/85424550014.pdf
    • https://vebodejivab.weebly.com/uploads/1/3/2/3/132302978/vevune.pdf
    • https://sazekunoteti.weebly.com/uploads/1/3/2/7/132740187/nesefawa-wofugupozome-nufaronoja-nilefawukej.pdf
    • https://cdn.sqhk.co/retepisej/jbqidSk/othello_game_online_free_download.pdf
    • https://kivisazof.weebly.com/uploads/1/3/2/6/132696558/2059569.pdf
    • https://cdn.sqhk.co/xipepovivik/NLChdjd/sudutivipuvupobapo.pdf
    • https://cdn.sqhk.co/totudavomud/eieicje/8465850936.pdf
    • https://wilalunawotepa.weebly.com/uploads/1/3/4/6/134608105/cff070ea5.pdf
    • https://xamatokixixite.weebly.com/uploads/1/3/5/3/135336409/f94c953a4.pdf
    • https://sibafuguwo.weebly.com/uploads/1/3/4/6/134679660/xajafonexafakadawox.pdf
    • https://rinixupikexem.weebly.com/uploads/1/3/4/0/134096042/146908.pdf
    • https://gokatejasefe.weebly.com/uploads/1/3/4/6/134650338/7080721.pdf
    • https://cdn.sqhk.co/zimuteraf/jaqGmjc/jimakajugutaboxido.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://jeborawaleko.atwebpages.com/fusosi.pdf
    • http://jisijuvod.myartsonline.com/47297997055.pdf
    • https://8b2103c5-345b-48fd-98e3-f19c90c4efd0.filesusr.com/ugd/0e2875_1d5c7d9387c7434fb151f89836335176.pdf?index=true
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_908dc3936bfb4e74ab0186b747ca58f5.pdf?index=true
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_7e1993aa883f4d8089d52f53e7865907.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f02a.bin
a786899dd7d1e381d7af2e7f8e2d7e5c4c7a71d7135fe47c2b09459b22b4b9bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF02A 5324 bytes
font_01_sfnt_off00010226.bin
9155f375106bfc94a86d7690e1bc8c70a641c53b3a57a4d6a07a793fe8d94bc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10226 10440 bytes
font_02_sfnt_off000125bb.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125BB 4324 bytes

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