Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ec45536be048b9…

MALICIOUS

PDF

69.1 KB Created: 2021-02-18 12:41:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ed63d3bafbec4fca5f38aa6b8644febe SHA-1: dd577bb3422c764558795491490786983f48fa0e SHA-256: 81ec45536be048b99933af44d18f6d45eb02029be25e60c8c30cae7ca0a15400
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded URLs pointing to suspicious domains, including one that appears to be a link farm designed to redirect users. The document body, though heavily obfuscated, contains text related to 'Computer programmer bachelor's degree salary' and 'wkhtmltopdf', suggesting a lure to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=computer+programmer+bachelor%2527s+degree+salary PDF link annotation
    • http://xojetupamowub.iblogger.org/beneficiary_designation_form_transamerica.pdfIn PDF document text
    • http://jonariz.22web.org/carbonyl_reaction.pdfIn PDF document text
    • https://cdn.sqhk.co/padasagam/ejfhcji/washington_crossing_the_delaware_river_american_revolution.pdfIn PDF document text
    • http://firstreadersclub.com/8685181877vdn4q.pdfIn PDF document text
    • https://cdn.sqhk.co/remezebona/hiibHsb/gofatupideliteror.pdfIn PDF document text
    • http://botojagi.iblogger.org/risup.pdfIn PDF document text
    • https://cdn.sqhk.co/daposofoxig/jjAxhgN/47514255117.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://baromar.epizy.com/bosch_double_oven_installation_guide.pdfIn PDF document text
    • http://bomajada.epizy.com/allison_road_pc_game_free.pdfIn PDF document text
    • http://puwodadivuxasaf.epizy.com/xelozemoxunuxib.pdfIn PDF document text
    • http://dekifovep.epizy.com/anestesia_regional_definicion.pdfIn PDF document text
    • http://popadugabi.rf.gd/69852872693.pdfIn PDF document text
    • http://jedejuleler.epizy.com/capecitabine_mechanism_of_action.pdfIn PDF document text
    • http://zikofizoredu.rf.gd/ziwilogekuzelaxanutu.pdfIn PDF document text
    • http://rudavuzapu.rf.gd/crazy_girlfriend_meme_template.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_off0000cf02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF02 5668 bytes
SHA-256: 1485483fdc2fc110ee071143c941c92a301fa9227101f57627938566af1e8624
font_01_sfnt_off0000e21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21E 10864 bytes
SHA-256: 2dd6b8d756cdf2363988fef60481adf68ce877010ce7abd2a7ed34bd7a084f1a

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