Malicious PDF — malware analysis report

Static analysis result for SHA-256 7331ffa36b227872…

MALICIOUS

PDF

84.8 KB Created: 2021-03-06 19:28:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5858b214b9e06d546215e75f7e72a3bc SHA-1: 26118e60715128929ee2b050fc1f5c67a64e2d11 SHA-256: 7331ffa36b2278723718201fa3b3a055bf2e23e1add2e75c723cd9de030acd5a
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous external links, many hosted on disposable domains, designed to lure users to malicious content. The presence of embedded URLs and the structure suggest an attempt to direct users to potentially harmful sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://vilenefex.ru/123?utm_term=verbos+en+ingles+y+espa%25C3%25B1ol+con+pronunciacion
    • http://bhd-management.space/phishing_email_template2r7gz.pdf
    • https://cdn-cms.f-static.net/uploads/4383687/normal_603a76c5eb4f6.pdf
    • http://hd-cam-mirror-up1.club/cat_rescue_near_me_no_killj6fy6.pdf
    • https://cdn-cms.f-static.net/uploads/4385887/normal_601a38f147ef1.pdf
    • https://cdn-cms.f-static.net/uploads/4488141/normal_603a96da0d22a.pdf
    • https://static.s123-cdn-static.com/uploads/4472486/normal_5fdf5dab18242.pdf
    • https://vabinori.weebly.com/uploads/1/3/4/3/134348027/roroxiwomotekedukaja.pdf
    • https://xasamaxubema.weebly.com/uploads/1/3/5/3/135387487/4236790.pdf
    • https://static.s123-cdn-static.com/uploads/4479226/normal_5ff470ff226cd.pdf
    • http://drenajkrasnodar.ru/h20_mop_x5_replacement_pads29702.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vefagotoje/contract_dispute_lawyer_near_me.pdf
    • https://s3.amazonaws.com/julaxel/indian_navy_mr_admit_card_2018.pdf
    • https://e9155d39-0f7d-4366-9ee8-34e17fe3d773.filesusr.com/ugd/9e05b8_8c6a89533ee54b86a3d93d92f8cde646.pdf?index=true
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_0f066568baa74f568f9cc68b611a1214.pdf?index=true
    • https://1b15a19f-c8c2-4d9d-8c2f-e97aa7ecfe2c.filesusr.com/ugd/eb6c48_c589e387db304403ade6954fd086ec2e.pdf?index=true
    • https://s3.amazonaws.com/julaxel/70758413288.pdf
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_e4c9138858c74996b89e0986f55faa03.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e88f.bin
b3dfb2f2c41da7350fc3755141d2fd0ea5796bb125df25fec831093623ff73df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE88F 2900 bytes
font_01_sfnt_off0000f2d2.bin
a4d49d386a82d3551b7b8f06b274d120bff9798fa68cac276c2b7cd0d87a8d4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D2 5520 bytes
font_02_sfnt_off00010569.bin
83d4b0bf530fe656b82ed38ee7891b3394320aaacc7617adcda084ff4b9bcf28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10569 11976 bytes
font_03_sfnt_off00012cd2.bin
177d8f3527965a312195fa9391d9fb6866d5e8bb483bb4cd0688ea056f8ef1f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD2 16388 bytes

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