Malicious PDF — malware analysis report

Static analysis result for SHA-256 b30a0f16d8feb102…

MALICIOUS

PDF

80.5 KB Created: 2021-09-02 13:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 13ca2025a649968f42ae3b7c9fb5b00b SHA-1: b6c95a7aeb27b8ce93843f042f8a27647ca3ec58 SHA-256: b30a0f16d8feb1028a2d418a6a6bd628e8faa2174f79d5d3f4a53d954c8d746d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to other PDF files hosted on a variety of domains, many of which appear to be disposable or low-reputation. This structure suggests the PDF is part of a link farm designed to lure users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=lyman+47th+edition+reloading+handbook+pdf PDF link annotation
    • http://jinanxintiandi.com/userfiles/files/27087902424.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/sonipesagegiliwalutesa.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/xasitesixe.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/18918060418.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/pejidixopu.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/88729959743.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ff3b6177c---xokizudagowufu.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/10453842585.pdfIn PDF document text
    • https://cristalensi.com/public/File/vosab.pdfIn PDF document text
    • http://baovevietnam-vnss.com/upload/file/57635906091.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/nefiwilemolurubeve.pdfIn PDF document text
    • http://ucity69.com/clients/861769/File/fiborekilojumagakava.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xetov.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/wutavavisigusajo.pdfIn PDF document text
    • http://falconltd.pl/cache/file/sulejoxopemajejosebilunas.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/4816941200.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/59739369194.pdfIn PDF document text
    • https://krossi.ru/images/content/files/61372201801.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/25883075463.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/towowak.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/nimovusavanebik.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_off0000d2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C8 18284 bytes
SHA-256: f571df68fc5da6abf123f8bc58e335893823cf99bf1355fa4e4177e88c10bcab
font_01_sfnt_off0001026d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A84 11208 bytes
SHA-256: 6945f9ab58ace469a274b05858dd1b24b436b81bc4779dee9a0874f2e965b90f

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