Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f7cd2703fb8d80…

MALICIOUS

PDF

88.8 KB Created: 2021-03-28 16:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c1b8b9f15253376c902e907ea5c1cfc7 SHA-1: 64db4e09f9c70938b57781bdaeb36d82a05df46e SHA-256: c6f7cd2703fb8d807af3aa550d89f5e02f598c4dc115b96d62e24428892b9b26
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and exhibits characteristics of a link farm designed to redirect users. The presence of external URIs and the 'link farm' heuristic strongly suggest an attempt to direct users to potentially harmful websites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://leonvi.ru/strik?utm_term=blackmagic+atem+mini+price+in+india PDF link annotation
    • http://vexidizagopukib.22web.org/athlean_x_workout_free.pdfIn PDF document text
    • https://cdn.sqhk.co/zeliravepuj/hgighU8/cinergy_cinemas_copperas_cove_tx.pdfIn PDF document text
    • https://cdn.sqhk.co/suwapipejob/hcSviiz/franchise_vs_sandbox_planet_zoo.pdfIn PDF document text
    • http://mivetofim.22web.org/windows_10_64_bit_bagas.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/VIPhhN0/86524670360.pdfIn PDF document text
    • http://zizopeja.22web.org/sean_paul_trumpets_ringtone.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/bmw_f10_m5_manual.pdfIn PDF document text
    • http://kufagexuwinu.22web.org/myelodysplastic_syndrome_guidelines_nccn.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/ejhhdKe/endless_ducker_mod_apk.pdfIn PDF document text
    • http://winokuzovew.iblogger.org/69320806871.pdfIn PDF document text
    • https://cdn.sqhk.co/teforoke/h5idlib/55966431358.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lonivone.rf.gd/73264981351.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35b04796-ddd3-4684-a65d-320ebc16744d/how_to_order_jersey_mikes_delivery.pdfIn PDF document text
    • http://jupasugego.rf.gd/picsart_pro_mod_cracked_apk.pdfIn PDF document text
    • http://lujifub.epizy.com/lowafekavedu.pdfIn PDF document text
    • http://xasagode.myartsonline.com/what_is_cos_tan_sin.pdfIn PDF document text
    • http://bavizajo.epizy.com/91953463044.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81df5af3-54ed-46f5-b351-305c4c5b8975/keredi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d35a43f-394d-4c10-8ccd-b9f9fddee673/define_the_concepts_of_habitat_and_niche.pdfIn PDF document text
    • http://xuwuxubemepimox.rf.gd/fezumamimopo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e028a597-6d43-433a-90fc-904823e75d24/can_you_get_ripped_with_trx.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/168d2471-75c0-406f-8adc-8aa90c61980c/hp_laserjet_pro_400_m401n_airprint_setup.pdfIn PDF document text
    • http://luzeparuzibez.rf.gd/8524243172.pdfIn PDF document text
    • http://toronakurimub.epizy.com/giorgio_agamben_the_open.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://scripts.sil.org/OFLIn 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_off000109ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109ED 5328 bytes
SHA-256: 39a37f3e805b8cc500b90dbb5ba0a164ae023405b5db7d2c622b5019f84cb648
font_01_sfnt_off00011bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF3 10196 bytes
SHA-256: cdfa6f0de5746ee88bd247fb01086449a472eacf477cb3d4cd4b448e873e8402
font_02_sfnt_off00013ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC7 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7