Malicious PDF — malware analysis report

Static analysis result for SHA-256 fabda39230f41787…

MALICIOUS

PDF

74.0 KB Created: 2021-09-21 20:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 556e593fad5295ffd9915396c4ec280d SHA-1: a9f415216739f0d7d41002a3bb0149ca3e4d1495 SHA-256: fabda39230f41787682b37e707760bd6adc4ec897ce08c3be67fbfc0cb6c1847
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, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which are structured as link farms. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://krisoc.ru/uplcv?utm_term=z+plus+tv+apk PDF link annotation
    • http://tokyo-sanritsu.com/userfiles/file/lofela.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/latumatumonebaf.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/84843158234.pdfIn PDF document text
    • http://orthopediedelft.eu/files/53712728532.pdfIn PDF document text
    • http://njchemland.com/upload/files/surek.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/xamozobaxavodime.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/zufomimiw.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/lumem.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/0132b3bc874e1a57db95fff8a9f60977/rokukofabudaru.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/malatezogujabuba.pdfIn PDF document text
    • http://rsst77.ru/upload/files/35983012222.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/210905142051625654gwktx.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/56862041289.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/58190427366.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/tawalodepukojebet.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/bisarozirikixedaf.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/nimizuzi.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/kirijumibugusiv.pdfIn PDF document text
    • http://gnox.vn/upload/files/15644242468.pdfIn PDF document text
    • http://goldia.cz/data/file/30203083855.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/gemujiruge.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/95948547825.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/49410942870.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_off0000bf4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF4B 9916 bytes
SHA-256: 6982354bffd2275d8cbebf76531bbe6f93cac63ba236117e4990963ce1a0308c
font_01_sfnt_off0000d566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD566 17408 bytes
SHA-256: b18e542773ee24200e741174725470daad8366ecf2feab42be1c3daa6fbb4585
font_02_sfnt_off000102a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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