Malicious PDF — malware analysis report

Static analysis result for SHA-256 71cb1598f0cf5b66…

MALICIOUS

PDF

85.8 KB Created: 2021-09-19 00:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3835958ac91ba14612e9d74c1be11755 SHA-1: 58d61fac1f839ed884edc11d972ab7a1c1b8bbc4 SHA-256: 71cb1598f0cf5b66e22c16ef582e60910c964982863ec742c93b762470f2b55c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, a common tactic for phishing or distributing further malware. The heuristic 'SE_URGENCY_LURE' suggests the document may contain deceptive content to prompt user action, although the document body itself is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://huntic.ru/uplcv?utm_term=a+christmas+carol+questions+and+answers+pdf PDF link annotation
    • http://sobateracota.ro/mm/file/75363550476.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/xigududogi.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/35518320116.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/madumejejodelurev.pdfIn PDF document text
    • http://coachhouse.info/assets/file/53665539811.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/nalixugopotokexakowipope.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/leboxuwize.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/wudufaxefixenukelezigis.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/vagetizitotifulemakigax.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/79081840656.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/27457812657.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/fonirowomejarawovibizakur.pdfIn PDF document text
    • https://angkagenap.com/contents/files/1391873896.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/4895425786.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/75806438551.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/kapixuzidulasupuwewiraf.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322db8548ba---nuburenifupuleturimab.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/zedufojatugabubusivur.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/37370874040.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/78095829783.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/tupexazozujix.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/76387311376.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://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_off0000e7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D8 18056 bytes
SHA-256: 4fad47a4c90646051359c073e80c8639e03d8e7e189e1d37f7403f763c1d30f9
font_01_sfnt_off00011700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11700 11196 bytes
SHA-256: e8e83bf772739aef7f1ceaedb8342bd5aabdcb45b28f61a6c5d0e7fffb1483f5
font_02_sfnt_off000130e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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