Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb77b0954406fe4d…

MALICIOUS

PDF

77.0 KB Created: 2021-02-28 00:46:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 854b78b2743aa4fc57ba1120629b1657 SHA-1: 77e4805ec421c27a3ae31a58de3ab10f90ea6931 SHA-256: cb77b0954406fe4de87663a3b88d07710ba69cb34fd105108460b6929c25a3f9
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing and malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this behavior, indicating a deliberate attempt to create a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or credential harvesting.

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://druttle.ru/strik?utm_term=percy+jackson+the+lightning+thief+summary+chapter+5 PDF link annotation
    • http://instasale.company/lanubadakubeziwifadivikur128f3.pdfIn PDF document text
    • http://gipogup.sportsontheweb.net/ejemplo_de_manual_de_politicas_y_procedimientos_de_una_empresa.pdfIn PDF document text
    • http://netlysy.online/police_report_writing_pptfvbvx.pdfIn PDF document text
    • http://vehicleinsusa.com/rametaduxajiwc55rh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463006/normal_5ffc7303e4313.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470380/normal_60390dbd31f62.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/what_are_the_different_types_of_contrast_in_art.pdfIn PDF document text
    • http://kozidozilujivox.getenjoyment.net/basutisigafofob.pdfIn PDF document text
    • http://rilotelexewobos.iblogger.org/carcassonne_mini_expansion_rules.pdfIn PDF document text
    • http://lonumawewexupo.22web.org/american_heart_association_blood_pressure_guidelines_2017.pdfIn PDF document text
    • http://forajadafogaxuv.medianewsonline.com/71535659301.pdfIn PDF document text
    • http://polobasopika.mywebcommunity.org/kodimibokuxanawe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wugujub.onlinewebshop.net/nokubaxobigomubejawevikaf.pdfIn PDF document text
    • http://kubagaxupusu.epizy.com/kantar_icube_2018_report.pdfIn PDF document text
    • http://sorisavitekinuj.onlinewebshop.net/dutch_grammar_exercises_online.pdfIn PDF document text
    • http://rojanesifilagu.myartsonline.com/code_name_verity_summary_part_1.pdfIn PDF document text
    • http://mogazijanadoro.rf.gd/how_to_lose_weight_by_drinking_lemon_water.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_off0000e561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE561 5796 bytes
SHA-256: a4f9d6f0e5e818eb26d54a4935fb57336d8b67242e3dfda3108c57270fa3a7e9
font_01_sfnt_off0000f907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF907 1800 bytes
SHA-256: 6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee
font_02_sfnt_off00010197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10197 10568 bytes
SHA-256: ef8764343b16d07c57af78f5e25b0eea03178b159afaa824e2973d303cbefe74

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