Malicious PDF — malware analysis report

Static analysis result for SHA-256 c67b85c2edeec378…

MALICIOUS

PDF

78.5 KB Created: 2021-02-20 04:51:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 0128dae4ffaa721ee638d35670950f17 SHA-1: b7c2442a89e494cc58e9b7bc34f51c9dddf1f93b SHA-256: c67b85c2edeec3788870d59b8402ebcda68ed69445e9ec809a093574d38dba3e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and potentially malicious hosting, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the presence of many external URIs suggests an attempt to redirect the user to a compromised or malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=how+to+start+a+paragraph+examples+words PDF link annotation
    • http://cuzinfo.ru/19196419261a9qo8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446789/normal_602eb1b372c82.pdfIn PDF document text
    • http://teleporttur.ru/954053228143sdti.pdfIn PDF document text
    • http://zujazufomok.iblogger.org/saeco_odea_giro_plus.pdfIn PDF document text
    • http://d2-club.ru/nigijepikomedilibupob1m4is.pdfIn PDF document text
    • https://wapixanap.weebly.com/uploads/1/3/1/1/131164574/sebadex_vanilogipoder_tawavowid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_6021d05406cee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421639/normal_5fe6c65b96010.pdfIn PDF document text
    • http://hr-insider.com/13942750688npxlv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417535/normal_5fd64c515659d.pdfIn PDF document text
    • http://topuniversityru.fun/how_to_calculate_business_income_tax_in_ethiopiaapnxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tesapibebujep/mann-_whitney_u_test_reporting.pdfIn PDF document text
    • http://magakawigola.epizy.com/petisibepalaj.pdfIn PDF document text
    • http://pilevujomeludo.rf.gd/what_is_navy_necc.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/how_to_turn_on_camera_on_hp_probook.pdfIn PDF document text
    • http://zufarelizija.epizy.com/bloody_valentine_full_movie.pdfIn PDF document text
    • http://pisironebininuw.rf.gd/frontline_commando_2_mod_apk_unlimited_all.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE857 5128 bytes
SHA-256: d400658b1428672d4ac770b2b352552b1847237546120fc75fbfac09b44bfc86
font_01_sfnt_off0000f9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DE 10788 bytes
SHA-256: 0cb60bdebbcceac0872c6c4f0481ce64a9dc7aca767e18dfabc9418c75dfb261
font_02_sfnt_off00011ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED7 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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