Malicious PDF — malware analysis report

Static analysis result for SHA-256 0714282418f5dfa8…

MALICIOUS

PDF

79.9 KB Created: 2021-05-29 04:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1853003962cc96ef77c1fa88af41b227 SHA-1: edd939f3570ada9b7d196d4d0fe3e982f6efee6d SHA-256: 0714282418f5dfa8b74b632363c0caf4d48cac400818bf7c5197ce150cc1bf0c
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 pointing to various PDF documents hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute further malware or phishing content. No scripts were extracted, but the presence of numerous external links suggests a potential for drive-by downloads or redirection to malicious 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://dugedepap.ru/strik?utm_term=actividades+de+fracciones+propias+e+impropias+para+imprimir PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372373/normal_605be0ea0ddbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466161/normal_601153d1611c1.pdfIn PDF document text
    • https://gamiwejejorar.weebly.com/uploads/1/3/4/4/134498461/vofegixepox.pdfIn PDF document text
    • https://juwarojolajekol.weebly.com/uploads/1/3/4/1/134108785/gevowo_duter_fisepoga_sobulobodolov.pdfIn PDF document text
    • https://getukesi.weebly.com/uploads/1/3/4/7/134735407/d844719ff5f3e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411923/normal_6010836db615f.pdfIn PDF document text
    • https://ladeletoleworuw.weebly.com/uploads/1/3/4/7/134712388/730dbcc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368497/normal_6064b8c3b5a92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466370/normal_604a54b1a0338.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375206/normal_604214144e1e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420468/normal_606ae2faf0611.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466664/normal_6048daefea7c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387925/normal_6014660c40a9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487888/normal_5ff5f82b39fba.pdfIn PDF document text
    • https://ximavubakalik.weebly.com/uploads/1/3/0/7/130776508/safedijekeke-balabanixawu-magejiwat.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/b8435efb-4d1a-4768-9b8e-67b2f0eaf921/14254117036.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/133c4cb8-b7e2-4df6-a66b-6a49d35c1a9d/sahih_bukhari_book_in_urdu_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a4fa100-ebf4-40ac-a14c-0b463d779ef9/gawakot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e572d2-0504-421c-9633-037a122c5de1/xemukoxi.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_off0000e026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE026 5316 bytes
SHA-256: 7abca0f26a414a36b6f0372be92aa4a6a43a3e86e15a9a2ab4845f7081184ac0
font_01_sfnt_off0000f231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF231 12348 bytes
SHA-256: 98df74922906f0a1cc299b827922508e0be768c461d9d577e68f3d938d174ea8
font_02_sfnt_off00011aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAE 16124 bytes
SHA-256: 160a156ea896e4b5f058735de66997a4342b38ce6e8cba643e0512fb9cd539f7