Malicious PDF — malware analysis report

Static analysis result for SHA-256 2715ed23aae7055c…

MALICIOUS

PDF

84.9 KB Created: 2021-03-26 01:17:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: dbc9a6adacec9ed684ed15ce63442d65 SHA-1: a48d7f9ad84c25127ff2feec5083af452d05caa4 SHA-256: 2715ed23aae7055c82a2de877082cd2a829bb7f6a3ac0e743d524e0124f687dd
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm indicate a potential for distributing further malicious content or phishing pages.

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://fokemale.ru/award?keyword=agrobacterium+tumefaciens+ti+plasmid+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450727/normal_5fdebdf0e416f.pdfIn PDF document text
    • https://cdn.sqhk.co/kibizatududo/he1R9AO/xunis.pdfIn PDF document text
    • https://cdn.sqhk.co/neliwuwo/ohbnQgc/driving_zone_2_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378153/normal_6037dfd5b8084.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404107/normal_603be77edc65a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486363/normal_6044d6e46242f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413243/normal_603bb03959a38.pdfIn PDF document text
    • https://cdn.sqhk.co/folikulezig/0mjbHmT/94228976711.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480149/normal_6048045ea490c.pdfIn PDF document text
    • https://zejenabo.weebly.com/uploads/1/3/0/9/130969472/zopisaxem_wedolejezal_dabejinupazom_gitesuz.pdfIn PDF document text
    • https://pilinasovoda.weebly.com/uploads/1/3/4/1/134132167/21872.pdfIn PDF document text
    • https://cdn.sqhk.co/lilomovetum/Cjh8YID/consolidated_theatres_pearlridge_showtimes.pdfIn PDF document text
    • http://sakazopipabuw.22web.org/el_alquimista_strain.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415754/normal_6033f926bfa49.pdfIn PDF document text
    • https://vipavogezeguw.weebly.com/uploads/1/3/1/0/131069860/f3e3f9b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xosekipile.rf.gd/algoritmos_matematicos_ejemplos.pdfIn PDF document text
    • http://bolirazebaf.myartsonline.com/devix.pdfIn PDF document text
    • http://pakoxerevigere.epizy.com/abstract_photos_hd.pdfIn PDF document text
    • http://jadivepijuga.myartsonline.com/libro_para_aprender_a_leer_la_mano.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_off0000f8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DA 5604 bytes
SHA-256: 426641f52b511adbe419f98b28198cc88ec7f71951b812c74f1fbd28dd36fcff
font_01_sfnt_off00010bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD7 10872 bytes
SHA-256: 0f188b11d74d9b3fb50c5f688fe95a6520c3244ba73bb4a3aaae77724e332c14
font_02_sfnt_off000130f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F3 16148 bytes
SHA-256: ebaa9d42c58e3fd25c8264bcf4ef2319fee467c92cf53dcc1f377a20fc8d39b0