Malicious PDF — malware analysis report

Static analysis result for SHA-256 93a314ffe55f1cd1…

MALICIOUS

PDF

84.1 KB Created: 2021-09-18 09:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bab9ff3dcba1890ed9bb2658f4554b19 SHA-1: 1a93c6731d04f344609329d2645b08cd26580c82 SHA-256: 93a314ffe55f1cd13f8cfedf5b85d830802ea1a77908a7ef6f1c1cb98800a782
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The 'SE_CLICKFIX' heuristic indicates the document likely uses social engineering to prompt the user to press Win+R or paste a command, bypassing macro restrictions. While no scripts were directly extracted, the presence of external URIs and the nature of the ClickFix attack suggest an attempt to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 http://cinstech-inspect-survey.com/fckeditor_userfiles/file/33708038108.pdf
    • http://megalabsrl.it/userfiles/files/vakakugofalikuxizuriw.pdf
    • http://nguyenthaotech.com/upload/files/48735213706.pdf
    • http://papierplus.pl/userfiles/file/66221769741.pdf
    • http://robalton.es/Albums/images/file///66166134252.pdf
    • https://porfic.com/fotos/file/xedafukuromimabod.pdf
    • https://www.abrasco.org.br/ckfinder/userfiles/files/28914912090.pdf
    • http://studiolauramoschini.it/userfiles/files/91534394163.pdf
    • http://harissarantis.com/userfiles/files/97737334592.pdf
    • http://littlepearlspublishing.in/data/eimages/file/resoxumusinikinejagerisus.pdf
    • http://alumcity.ru/userfiles/file/wodurujaratifutu.pdf
    • http://porpora.group/imagenes/imagenes_contenidos///fipigo.pdf
    • https://xyoaa.org/sites/default/files/files/fexolidulizuvojiguzuvisuv.pdf
    • http://aydinservis.com/ckfinder/userfiles/files/vosilapagogifonalosiloza.pdf
    • http://teifsepahan.com/files/file/zavewaroguxuma.pdf
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/puvoxuwawew.pdf
    • http://jl-vacuum.com/upload/files/repixekewivivex.pdf
    • http://likebarcode.com/image/files/20210913_220940.pdf
    • https://hoatuoi360.vn/uploads/files/senibiso.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614061b4d2dfd---71218570882.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/1c19fc3203c6975600eddca4f30f1893/wonama.pdf
    • http://dade666.com/userfiles/202109file/2021090117232270554.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=nfs+most+wanted+all+cars+unlocked
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e196.bin
c6a93ffc8661183be8c149d372a36684ca6be4bdf96d854625f23f154a63368f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE196 10800 bytes
font_01_sfnt_off0000fa93.bin
5622e4d4949e96462bac6dda8144549ee71ee1e598450f88c059b89cf974bbe7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA93 18352 bytes
font_02_sfnt_off00012a94.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A94 16792 bytes

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