Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7643a678afabf25…

MALICIOUS

PDF

79.7 KB Created: 2021-03-15 22:41:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 53bc6fd555e3cdbf5d20d845da13ec82 SHA-1: bef6b32e9285c45051b993828bdbe8d8d15c6170 SHA-256: f7643a678afabf25d879c0d7a9ca0cfbeb1e1da754fb17f30719afeb6887e927
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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=eheim+2217+filter+media PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471230/normal_601ce675b3e73.pdfIn PDF document text
    • https://lafajadisevo.weebly.com/uploads/1/3/1/4/131454770/5218441.pdfIn PDF document text
    • https://rurezakofone.weebly.com/uploads/1/3/1/1/131163981/gavejadevav-zuremenaguda-vasegimo.pdfIn PDF document text
    • https://fivomatimib.weebly.com/uploads/1/3/1/0/131070631/2989164.pdfIn PDF document text
    • https://junerokiwoji.weebly.com/uploads/1/3/0/7/130775834/koborimopanadukoxip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410206/normal_5fed37ca9605e.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/Q1hbBhg/lifumuwa.pdfIn PDF document text
    • http://vetobiz.sportsontheweb.net/can_you_use_cleaning_solution_in_a_steam_mop.pdfIn PDF document text
    • https://zetojaxonafavop.weebly.com/uploads/1/3/5/3/135309172/guvemuvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451757/normal_604a88bead32b.pdfIn PDF document text
    • https://cdn.sqhk.co/junulevi/hd8dEjd/dazasivexuduzerew.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/UhgzgiQ/nowujegimufirad.pdfIn PDF document text
    • http://mofonuf.medianewsonline.com/formal_email_format.pdfIn PDF document text
    • http://jonotijero.medianewsonline.com/pilud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411229/normal_602a43bbf40df.pdfIn PDF document text
    • https://cdn.sqhk.co/zezugiwetibe/e8ohaib/new_pokemon_game_2018_android.pdfIn PDF document text
    • https://kolokizegilo.weebly.com/uploads/1/3/4/3/134370221/tegizemu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6453c1de-22e3-4363-b599-30ff56f812b0/xalafar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a65fa1a-09ed-4708-9a13-deee8a2af6aa/wekuvufagomaled.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3abed922-7489-4a33-ae29-6a0964cadad2/4065391019.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF869 5192 bytes
SHA-256: 163fbdad1095793a6d7cb26f3fab0f51f2a5131c8846af4a6e4708b7d4de7535
font_01_sfnt_off000109ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EE 11568 bytes
SHA-256: 8b3e3866d808f82d28744c910d7af7bf57f07f01008f51a4fbd12f6999350be6