Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d52c0bfd7376f1b…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 18:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9650cff07ea151c3dad990a8a16430dc SHA-1: 44c29039bfcc5abff02e28be35c16b8cb9d272d3 SHA-256: 7d52c0bfd7376f1bf37df898d26cce09ebd7d55bee600541e1041f29c5109bf1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed to redirect users to potentially malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://synerhu.ru/uplcv?utm_term=audio+recorder+apk+download PDF link annotation
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/soladoresi.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/pirulitazi.pdfIn PDF document text
    • https://eltdb.com/UserFiles/files/87974375786.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/fiwebakovojukakuzoxupebob.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/66363648614.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/26867188917.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335ebbac7e1---jasogezeberesutegune.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/59755143181.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/ketunisisusegarawe.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/robumefesevolitodo.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/44920897834.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/jitagepene.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/96451542348.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/45668926807.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/masawibi.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/lenot.pdfIn PDF document text
    • http://ropesadventure.com/d/files/57066188241.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/72567298618.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/tufomikugabuzij.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/37778092391.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/xafigaviredu.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/natinupozulimabumefa.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/xatejezapaluzixibopu.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_off0000dd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD01 10500 bytes
SHA-256: 4bc2c02ee77f8142e710468c69591a32c41d1eadf7e75bcbe5631404e34eab5d
font_01_sfnt_off0000f506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF506 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D18 18008 bytes
SHA-256: dca4814bdd93f98b1b8404be54777183fa17cdb0290ce32da807da7e0b785578

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