Malicious PDF — malware analysis report

Static analysis result for SHA-256 6754a9d5a873b3df…

MALICIOUS

PDF

74.1 KB Created: 2021-05-21 01:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c806b6d19e2db3717363afd54885c5ce SHA-1: 211433b1d17005ef369693b0f5b7124949129495 SHA-256: 6754a9d5a873b3dfe6a0deed8abe42b39d41c0650a15d1d3dceeb5ae92c9b038
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for phishing or malware distribution. The embedded URLs, such as 'https://baarspo.ru/strik?utm_term=calibration+of+ammeter+voltmeter+and+wattmeter+pdf', are likely part of this malicious infrastructure. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://baarspo.ru/strik?utm_term=calibration+of+ammeter+voltmeter+and+wattmeter+pdf PDF link annotation
    • https://kuvuwivozud.weebly.com/uploads/1/3/6/0/136091804/motowaruzu_mosemivolat_rilelu.pdfIn PDF document text
    • https://mokadipubozot.weebly.com/uploads/1/3/2/3/132303064/gezudupojotum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487413/normal_600d4e66e9a45.pdfIn PDF document text
    • https://nozipukox.weebly.com/uploads/1/3/6/0/136057246/jejajoxix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493569/normal_60188d7db463b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493867/normal_604847125b7f2.pdfIn PDF document text
    • https://pujelewi.weebly.com/uploads/1/3/4/0/134017294/3967286.pdfIn PDF document text
    • https://jovapotokuxeb.weebly.com/uploads/1/3/4/8/134881142/4692725.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479674/normal_6062836d64936.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470221/normal_5fea21c7ca931.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423166/normal_5ffdb161eb59f.pdfIn PDF document text
    • https://bumilumijoxaxuv.weebly.com/uploads/1/3/4/4/134497753/1ea809f1bc68f26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423195/normal_5fd7877cd01ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407983/normal_5fe27095e3c34.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/8b0246f2-e0aa-4440-83a2-f1f3190526ab/miluvugapuxanelegaxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a5b38d4-1ec2-4f87-ac27-4e3a14e655f7/ascii_code_binary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e2422ae-90ae-4a80-b103-9a597e9db816/diono_radian_rxt_installation_forward_facing_latch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ba32552-e5aa-4cb2-9333-b7bbdd0ba2d4/67234394365.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5661bd24-a993-49c9-a4b8-f3328d7ed6e0/the_odyssey_summary_chapter_17.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9bd618c-7540-4838-84b9-0a5564db66ca/bixivarurusiguvusowekij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29061f7d-cf4a-43be-8198-720b8e354ed5/replace_cooktop_igniter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3a83c08-e55b-4a3a-9cd7-7f55d75bc2a8/38893020905.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_off0000cfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC4 5204 bytes
SHA-256: 767edc0ae21d949f9762aca950163a1617db99bcba86c2ac1af95b19fcfb5985
font_01_sfnt_off0000e172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE172 10488 bytes
SHA-256: b6d8445f1d024bc3d81f17e664fefc6efb76b57714b32c8a0cb52026df5f0c87
font_02_sfnt_off0001058e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058E 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2

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