Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f2266984193c826…

MALICIOUS

PDF

69.0 KB Created: 2021-06-09 14:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46b78000f1597b4fd19a4dfcdadc7177 SHA-1: d9c95c50244b081bb61d20da0e51e1bacc7cd1a5 SHA-256: 7f2266984193c8262decd9df1283c5835814a0bd041aeda67e5e194f5deac172
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one prominent URL pointing to 'jacksth.ru', suggesting it's part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of using disposable hosting for multiple links, reinforcing the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/123?utm_term=ingeteam+inverter+datasheet
    • https://cdn-cms.f-static.net/uploads/4422659/normal_60415d748af64.pdf
    • https://cdn-cms.f-static.net/uploads/4387715/normal_605828271f269.pdf
    • https://wabumixa.weebly.com/uploads/1/3/4/5/134585451/187150.pdf
    • https://vimopoferozure.weebly.com/uploads/1/3/4/8/134858925/sogajukak-dupapovi.pdf
    • https://cdn-cms.f-static.net/uploads/4446263/normal_6065b4aa285c1.pdf
    • https://cdn-cms.f-static.net/uploads/4444882/normal_600bfe30cf7ad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tebejeloxid.pbworks.com/f/87803298794.pdf
    • http://mupalunava.pbworks.com/f/romuxowowur.pdf
    • https://uploads.strikinglycdn.com/files/7e35e098-f147-4946-aeb5-4a4fd24e18c4/8973086565.pdf
    • http://jumogitakos.pbworks.com/f/46201080045.pdf
    • https://uploads.strikinglycdn.com/files/1828de18-0e53-419a-9849-f07939d26e9f/70570799315.pdf
    • http://mitamugukojo.pbworks.com/f/nudud.pdf
    • http://ruwezebom.pbworks.com/w/file/fetch/144736302/76649433397.pdf
    • http://gapufipi.pbworks.com/f/ap_biology_campbell_8th_edition_download.pdf
    • https://uploads.strikinglycdn.com/files/424da31e-449d-4528-a25c-4756c17add10/how_do_you_write_chord_inversions.pdf
    • http://giwupiraride.pbworks.com/f/10._snf_biyoloji_kaltm_test_indir.pdf
    • http://jujupaw.pbworks.com/w/file/fetch/144616707/6.pdf
    • http://mifimoruzuwo.pbworks.com/f/beyblade_burst_sword_valtryek_qr_code.pdf
    • https://uploads.strikinglycdn.com/files/9050608f-8d1c-4adc-a767-2f64cd3aaa4f/zufivuzurofezutos.pdf
    • http://kukepofarit.pbworks.com/w/file/fetch/144729330/59829540318.pdf
    • http://bazibenis.pbworks.com/f/bivobasamidivex.pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbdc.bin
b029c36a9c5a42726bb2d8a2fc28c5984e7916e3e4a7df2391d18cf143424f30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDC 5204 bytes
font_01_sfnt_off0000dd6d.bin
fc049de91a68b87c7c061ee06ad0f08c5de805d796e6b9f08953b4836536e975		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6D 12192 bytes

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