Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a125e68ca9a5ed4…

MALICIOUS

PDF

112.0 KB Created: 2021-03-05 16:21:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5fa87ca9d9e6dac503d2308bf2566283 SHA-1: 94f2ef0ed52868126e87ad43cec5cec9b6aa639f SHA-256: 8a125e68ca9a5ed4daff368bda92eee61fd6e3b0f1700e0fd6659f80e80fab4b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous URLs on disposable domains, with one prominent URL being https://nipisod.ru/strik. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content. The presence of multiple external URIs and the link farm heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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=ferrari+250+testa+rossa+0-60 PDF link annotation
    • https://wanesibib.weebly.com/uploads/1/3/4/5/134591449/8a6f256d6.pdfIn PDF document text
    • https://zedasadexim.weebly.com/uploads/1/3/0/7/130775923/5c1fde.pdfIn PDF document text
    • https://cdn.sqhk.co/moviferu/jhchjji/34886040165.pdfIn PDF document text
    • http://nipokaxa.getenjoyment.net/bumokizezex.pdfIn PDF document text
    • http://kibisiji.iblogger.org/pakatajezowijeke.pdfIn PDF document text
    • https://vinipuzi.weebly.com/uploads/1/3/0/7/130776781/2120827.pdfIn PDF document text
    • https://guvoxokogavi.weebly.com/uploads/1/3/4/3/134374443/2f07bf20.pdfIn PDF document text
    • https://cdn.sqhk.co/lewulula/LRuhehc/fupanozalitazuf.pdfIn PDF document text
    • https://xebolefijepipol.weebly.com/uploads/1/3/0/7/130739937/757772f4c68f402.pdfIn PDF document text
    • http://zejadovota.iblogger.org/famumafuwanomopu.pdfIn PDF document text
    • http://rarubife.mygamesonline.org/fugewodonoroxuvilunaroxa.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/fbf93d33-7289-4218-b175-dbc7526bd370/how_to_use_an_amazon_echo_as_a_bluetooth_speaker_with_your_iphone.pdfIn PDF document text
    • http://zenakezogutomu.onlinewebshop.net/why_is_my_heat_pump_not_blowing_cold_air.pdfIn PDF document text
    • http://wevedikelu.epizy.com/pet_insurance_claim_form_sainsburys.pdfIn PDF document text
    • http://xufoziminep.onlinewebshop.net/63014093806.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/51207720531.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/87883800596.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/nuniwetesutajima.pdfIn PDF document text
    • http://fukutinupamebo.rf.gd/65291285053.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b0779f5-983f-4e30-9c77-c4f5e4952760/how_to_use_my_masterbuilt_sportsman_elite_smoker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a7adb24-38e0-4513-96ce-716b277d37ab/motorola_surfboard_sb6141_reset.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000186fc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x186FC 24628 bytes
SHA-256: 524ac222e55dfaf001e71dade880090950cad51cbb1d36029580afcca77d840f
font_00_sfnt_off00014cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CBB 5188 bytes
SHA-256: f1dc9571c2894235e076c90e8c929e3776679d079285f449747bbfb704555fb0
font_01_sfnt_off00015e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E70 12620 bytes
SHA-256: d68084f42418562d70708388e1165976358aea2cc8fd177d5b0b639d2de20679

Open this report in the interactive analyzer, or submit your own file for analysis.