Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2d7b0d9a0280aa…

MALICIOUS

PDF

83.8 KB Created: 2021-09-15 23:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4494d48e832640f1bdb4c74643d945c9 SHA-1: 45dfba54d8e3152bffb10940d1e83c70ae62d522 SHA-256: 8c2d7b0d9a0280aa99e4edd992dde198ca0732f2639d3b67522d1c1c730fba7d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by multiple heuristics, including ML classifiers and ClamAV, as malicious and phishing-related. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in tech-support scams and callback phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users or deliver malicious content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ita.kru.ac.th/ckfinder/userfiles/files/mapogagivewigopedem.pdf In PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/69464273486.pdfIn PDF document text
    • http://ifap.it/images/file/lowigogiraveka.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/22775950992.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/wejawinemulaboj.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/38067f4d2d26dbc2386a651604eab837/13301992574.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/botuxakedadira.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/35606210843.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/67091530676.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161406410b8feb---saromorasoja.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/mawebonupizukuvapol.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/rabosabux.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/76281030632.pdfIn PDF document text
    • http://sial.pl/galeria/file/86891666367.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/0d14a178666c940031625c5c90e88c58/53393810564.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/98535589283.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/rasilosalonufuvosowolew.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18633706630.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/74869159474.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/nalovevegasuwevefo.pdfIn PDF document text
    • https://mavibusiness.it/file/peruwunorixofebunoper.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48231955374.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/22664024750.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/92035697666.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/7253915294.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=apk+subway+surfers+gamePDF 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_off0000df0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF725 10756 bytes
SHA-256: c9afc223ab70953b9143b6ef7d120a181dd460ffbd3f59e0e85892bf8f146559
font_02_sfnt_off00010fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD4 19212 bytes
SHA-256: fe4567b7bda3a57904c086ae2cb4ad4a576458c4eec1643aee483f208650b2c2