Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa97cad53833742d…

MALICIOUS

PDF

67.8 KB Created: 2021-09-25 02:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 52971a3915304586311179b785dd9481 SHA-1: e6e5144d0d9e2b86166d5f17ed5c38e03be1153f SHA-256: fa97cad53833742dde8e6ac458c5741fcd88a3ca33a0a7d55249cfb928d7f17c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to unknown domains and are structured as link farms, suggesting an attempt to lure users to malicious sites. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic further supports this, indicating a pattern of disposable hosting for link aggregation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://amt-alarmy.pl/userfiles/file/98013174137.pdf In PDF document text
    • http://thuonghieutoancau.vn/uploads/files/pizokigezavogapagekiverag.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/gizimofarefogixa.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/91920167638.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/nuxavabelunozefudi.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/gobimukefotikupedawapij.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/1530180218613a85276c76b.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/97929461707.pdfIn PDF document text
    • https://dafelia.com/files/migatebinove.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/fitisipoxikexotixiju.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/96033016566.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/govavuxonozepujunub.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8714edee4---49199326891.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210914140855.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/xarulatunebiro.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/47530076625.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/vikobipoxapexoruxebug.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/lavogoselapusesopabota.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/90077381165.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/29493361095.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161354de38e690---wexewasarejagalojad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=online+multiplayer+games+ioPDF 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_off0000ab2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB2D 14932 bytes
SHA-256: 8129cb122e616f94dd954d5cf8f479f6520dbbb27340055e8bbfaff6d86053f1
font_01_sfnt_off0000d0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90D 10832 bytes
SHA-256: a005f253205e25e945203547a24628e13c7c3f619abe826df312b6f70ff95117

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