Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ab0aafe5879263a…

MALICIOUS

PDF

78.9 KB Created: 2021-05-19 23:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bc3abce327a0f19353d328f4fe9db0f2 SHA-1: db92249709416634d5e66f699d10b9d331aca665 SHA-256: 2ab0aafe5879263ada1c2f4c57241fc201c9df03bfa67357e2d66324e2c5dc3a
142 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. The document body, though partially corrupted, suggests a lure related to an 'expense report template'. The presence of numerous external URIs, including one pointing to 'nipisod.ru', strongly suggests the document is designed to redirect users to malicious sites, likely to download further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/strik?utm_term=family+expense+report+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385424/normal_6017a72df214b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488837/normal_603c201d2d876.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491945/normal_603be8cfab81b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376103/normal_5ffa2679be65c.pdfIn PDF document text
    • https://tupadutuxoti.weebly.com/uploads/1/3/5/9/135974222/famijonaf_limopituvu_mejexog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426422/normal_5fe7e2a04be61.pdfIn PDF document text
    • https://xadonuxezi.weebly.com/uploads/1/3/4/1/134131919/75f2e5f709ac94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418567/normal_5fe9c4b6a6a53.pdfIn PDF document text
    • https://fulipevaxavu.weebly.com/uploads/1/3/2/6/132695351/latat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389793/normal_602175ef2ee84.pdfIn PDF document text
    • https://xapowukugo.weebly.com/uploads/1/3/4/7/134702937/lonedevakele_kalemesexumed.pdfIn PDF document text
    • https://merudaxesu.weebly.com/uploads/1/3/1/3/131383629/riragufurudeki-sukobibudasobob-tefesad.pdfIn PDF document text
    • https://kasewipiliri.weebly.com/uploads/1/3/4/9/134901701/tafiru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427079/normal_604c9c13b91b9.pdfIn PDF document text
    • https://vagajexaxe.weebly.com/uploads/1/3/4/3/134359414/xofabuletike.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/8f4fefac-b392-4943-bc3f-d798581c1785/alice_bailey_johnson_wiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dcef17a-58e9-4f52-bbdc-d60014c8dc33/gameboy_advance_sp_ags_101_screen_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/imperial_to_metric_unit_conversion_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/zukesagunate.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/fundamentals_of_digital_logic_with_vhdl_design_3rd_edition_solutions.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B1 5092 bytes
SHA-256: a74fd18f132a5f6817846d745da81d5629bca8ce0b95e40d08000f2db4ec8223
font_01_sfnt_off000108f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F9 11040 bytes
SHA-256: 01b5f9db78fc32b58cff5d27ceecbb824e5332098057e6b0371c6826a50f8efb