Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4275d109e05d170…

MALICIOUS

PDF

91.5 KB Created: 2021-05-13 21:40:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 4bf8266eece1616cfc3c22e36681558d SHA-1: 863bfbd7d40af4465095621713ee2e83b18e838e SHA-256: a4275d109e05d17016f84fb6a4a299bb51e3e8585d0c2a13bb43f91e212c54a8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The primary URL, 'https://soxebez.ru/strik?utm_term=torah+in+english+pdf', indicates a lure to a specific search term. ClamAV detection and ML classification confirm malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://soxebez.ru/strik?utm_term=torah+in+english+pdf PDF link annotation
    • https://zagibekopawof.weebly.com/uploads/1/3/1/4/131453283/6025967.pdfIn PDF document text
    • http://pazifelurup.medianewsonline.com/powuzexejonewupoxu.pdfIn PDF document text
    • http://buvozadiveniz.22web.org/the_land_of_stories_books.pdfIn PDF document text
    • http://xoxuvajes.mywebcommunity.org/gibirigunumutoli.pdfIn PDF document text
    • https://cdn.sqhk.co/tevosudav/jeRKgdD/pokemon_cards_cyber_monday_deals.pdfIn PDF document text
    • https://zoniziwaxetoxa.weebly.com/uploads/1/3/4/4/134441104/lolilonutubomefe.pdfIn PDF document text
    • https://cdn.sqhk.co/matajikiwov/19kCDij/efootball_pes_2021_mobile_trailer.pdfIn PDF document text
    • http://dabukim.mygamesonline.org/jacques_ranciere_aisthesis.pdfIn PDF document text
    • https://cdn.sqhk.co/pasojixaju/uih4hdj/82818748110.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wukevivetarapu.myartsonline.com/38220836595.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/what_increases_blood_pressure_short_term.pdfIn PDF document text
    • https://9fc80a0e-b25b-4135-afeb-9811a1ea6bf8.filesusr.com/ugd/91e123_bd75ce1e3f73414d996d8b49911dc252.pdf?index=trueIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_22d77ba2ec95415685d851987401e4bc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/charbon_actif_formule_chimique.pdfIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_cc8077dcb3ef48e9aa81c8a5bf0153a3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/blue_voice_software.pdfIn PDF document text
    • http://xobeminal.atwebpages.com/vuxudavolikikolox.pdfIn PDF document text
    • http://gokegufokefewev.rf.gd/48518326226.pdfIn PDF document text
    • https://b66a6cc6-7028-4fd7-9d19-084b2b27c535.filesusr.com/ugd/4015cf_a0c9167dec274afda48e681ae9d56637.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/ligowudax.pdfIn PDF document text
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_7c81ead366af4b05a3ee0c488d01a9b0.pdf?index=trueIn PDF document text
    • http://mudedomusakovag.epizy.com/93769445616.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CA 4960 bytes
SHA-256: 35afacb05a3d4c785e9f94c9b526ab7b8204d0fcf2119978575e0c616569aa2e
font_01_sfnt_off00012593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12593 13180 bytes
SHA-256: 5bb9869a8c1d3a86b86b50bfc788f352ab648930e45db359c96ac58bf25262c6
font_02_sfnt_off00015285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15285 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c