Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f90dcdf6ae58a9b…

MALICIOUS

PDF

83.1 KB Created: 2021-09-09 21:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c965a15f44726f9b109f20a4bd0efbb2 SHA-1: 9b37af266455a24266d2b5defbbc0346cdb42dc9 SHA-256: 5f90dcdf6ae58a9ba415b25cf386c9d6742f678de41d6c37aa6ab32d2a4bd320
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of external links, many on disposable hosting, suggesting a phishing or spam campaign. The embedded JavaScript and numerous links point towards an attempt to lure the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://efckrakow.pl/userfiles/file/fudikokawapewowidozopu.pdf In PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/64354584033.pdfIn PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/mazajewarovivasaw.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/65098662551.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/87263841381.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/20574953328.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/27cd68e03ace100aca880a69ba442713/32645599956.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/18992343888.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/dikuvavewinijoj.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/22218222795.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/61685239101.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54165755696.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/suvuxog.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/94786119184.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/pajiv.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/disex.pdfIn PDF document text
    • http://ymmicro.com/files/files/mokejar.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/77591266938.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/81075810319.pdfIn PDF document text
    • http://dominant.name/userfiles/file/rujisemowafivutorigunu.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/numedosufufunelazukovi.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/lezalivetuk.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/gufanuboson.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=pogo+ispoofer+iosPDF 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_off0000dda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA2 19680 bytes
SHA-256: bce58bcdd04e0a9eae400ceeb1034a0348e8a0ece111696d52135f34419dedb3
font_01_sfnt_off0001107c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12893 10124 bytes
SHA-256: 78f9b372ebc4597818d10f270fa7b40eb4f0cab16635fe3edfd1895d410b6b34

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