Malicious PDF — malware analysis report

Static analysis result for SHA-256 4690d675a11fce53…

MALICIOUS

PDF

107.0 KB Created: 2021-05-19 13:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2af8a83929156cf743ef64757186650b SHA-1: b288a82988cab66b709d89ee6c50d6101684e4a8 SHA-256: 4690d675a11fce5330b906eaf07baa4200f076767b8d091b3cbdbf1458441e61
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one pointing to 'zajinet.ru', suggesting a phishing or link-farming attack. The PDF structure and the presence of embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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://zajinet.ru/strik?utm_term=go+math+5th+grade+lesson+10.6+homework
    • https://cdn-cms.f-static.net/uploads/4415518/normal_5fe6a3aea97cb.pdf
    • https://cdn-cms.f-static.net/uploads/4419826/normal_603a819e259da.pdf
    • https://fifubinagate.weebly.com/uploads/1/3/4/8/134854053/gibegetin.pdf
    • https://sunitago.weebly.com/uploads/1/3/1/8/131856801/tovijuwitaxe-nakifatado.pdf
    • https://jaxufeloz.weebly.com/uploads/1/3/4/0/134013101/3546337.pdf
    • https://jabelobiwisaga.weebly.com/uploads/1/3/1/6/131636903/vibesufuw-jipuwobew-metofoxox.pdf
    • https://ledosixekesi.weebly.com/uploads/1/3/4/3/134313849/717452.pdf
    • https://motabuwupogofe.weebly.com/uploads/1/3/1/6/131607229/kejozesusuw.pdf
    • https://cdn-cms.f-static.net/uploads/4495269/normal_6068c68e6faa1.pdf
    • https://xukonixivuki.weebly.com/uploads/1/3/0/9/130969652/jenadadab-sedabeviduw.pdf
    • https://kuwupixunipava.weebly.com/uploads/1/3/3/9/133986845/gukewepakifigafaziw.pdf
    • https://cdn-cms.f-static.net/uploads/4491936/normal_5fd11549a273b.pdf
    • https://lavafijaxeb.weebly.com/uploads/1/3/0/7/130740432/2fe6489289c553.pdf
    • https://volokosebu.weebly.com/uploads/1/3/4/8/134871595/6339329.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c024b730-5850-49d2-8c15-a8f88e8f7dd7/ford_mustang_ecoboost_premium_convertible_rwd.pdf
    • https://s3.amazonaws.com/lorugipopuxe/kadokoxazelijupatajere.pdf
    • https://s3.amazonaws.com/feliso/enterprise_architecture_charter_template.pdf
    • https://uploads.strikinglycdn.com/files/a5957473-9ae0-4d6f-96e7-93ae1a188aa2/13844700245.pdf
    • https://s3.amazonaws.com/mexesazaxasa/how_long_does_it_take_to_cook_a_medium_sweet_potato.pdf
    • https://s3.amazonaws.com/dupula/vabizufujegotasogalivurug.pdf
    • https://s3.amazonaws.com/gomakobez/76911120554.pdf
    • https://uploads.strikinglycdn.com/files/ebedead8-fd3c-418a-b9a5-e0c4b511d3eb/nikon_fg_20_manual.pdf
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001637c.bin
921dc17b618fd5580196fdbf1f03dd9457845dccd5460310c797625f980cd1a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1637C 5928 bytes
font_01_sfnt_off0001779a.bin
ca3cb1c79155b1eda30e26cd0be4ddd0956f732a2e02db1ce4db6be7156a680f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1779A 11220 bytes

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