Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b3956347252d98…

MALICIOUS

PDF

81.0 KB Created: 2021-01-26 02:38:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 43aa13634651922599e89eb6b6559487 SHA-1: eef3c017273df77c99c55df783abcc7f5ee53374 SHA-256: 42b3956347252d98f0d96a3ce367140b2d66468aac3fca1ebbc4fa2e26cb2601
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to disposable domains and known redirector infrastructure, indicating a phishing or malware distribution scheme. Heuristics confirm the presence of malicious redirector links and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=fce+writing+tv+shows In PDF document text
    • http://getveran.site/apple_tv_just_dance_controller_not_workingnikpb.pdfIn PDF document text
    • https://silavetej.weebly.com/uploads/1/3/5/3/135314504/1426531.pdfIn PDF document text
    • https://worivoka.weebly.com/uploads/1/3/4/5/134588103/xajodifuxix.pdfIn PDF document text
    • https://sovinupuni.weebly.com/uploads/1/3/4/7/134762808/fidubevanu.pdfIn PDF document text
    • http://feyakast.online/nexivisitejelanendgn7y.pdfIn PDF document text
    • https://cdn.sqhk.co/lawotivu/Q5gIMji/yeezy_boost_350_v2_carbon_sneakers.pdfIn PDF document text
    • http://naturebiolog.fun/ben_10_up_to_speed_apk_data_mod5hosf.pdfIn PDF document text
    • https://cdn.sqhk.co/xisiwuba/gLQjbjh/16892100090.pdfIn PDF document text
    • http://btsworld.org/puzzle_3d_harry_potterax9m8.pdfIn PDF document text
    • https://numibogag.weebly.com/uploads/1/3/4/3/134323011/sagubadoja_jawumokaj.pdfIn PDF document text
    • https://cdn.sqhk.co/boxadiweteve/ije7hcr/building_guide_the_forest.pdfIn PDF document text
    • https://suzexefovewav.weebly.com/uploads/1/3/4/6/134640410/3179735.pdfIn PDF document text
    • http://naturwows.space/rorigitujijamile45.pdfIn PDF document text
    • http://tipografiyav.moscow/catch_fantastic_beasts25d9b.pdfIn PDF document text
    • https://vezutokabev.weebly.com/uploads/1/3/4/7/134758566/da74f95.pdfIn PDF document text
    • http://rent-nout.site/3631817508617sjy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vebenok/witatisibukaroru.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/elegant_business_powerpoint_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/wararifisanal.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/nightcore_music_player_apk.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_off0000ff73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF73 4924 bytes
SHA-256: 8155a1addb0c6d0c5ccd31f871751ab6847c69a6db5b0a72d327617c00aba048
font_01_sfnt_off00011052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11052 11584 bytes
SHA-256: 14aaaf87713acc0968b74d1dbcab6d0e867926fd578019cd23f559bc3fffa667

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