Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab5f6ba767b0e5cf…

MALICIOUS

PDF

90.9 KB Created: 2021-05-09 03:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 96d58cceae050679eecaa942509c5246 SHA-1: eb61ed983e5e09e7adfe5301ba325e04223b4fae SHA-256: ab5f6ba767b0e5cf6a695ab6eb7a89f3400f1f642fbc71b19b33e35a704edae6
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and the document body, though heavily obfuscated, references 'Sabertooth z77 specs' to likely trick users into visiting these sites. The presence of external URIs and link farm heuristics further supports a phishing or scamming attack pattern.

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://kuzutuzo.ru/strik?utm_term=sabertooth+z77+specs PDF link annotation
    • http://bafakuvim.sportsontheweb.net/equivalent_fractions_super_teacher_worksheets_answer_key.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412894/normal_6003fe546abcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379844/normal_60219ce44404f.pdfIn PDF document text
    • http://jisetatiloro.scienceontheweb.net/animals_and_their_young_ones_names.pdfIn PDF document text
    • http://fogexiduk.22web.org/actos_de_comercio_em_mocambique.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427095/normal_604c9d7fe145b.pdfIn PDF document text
    • http://mamewebifukuv.22web.org/runekafelojodev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404740/normal_605fb9ad3b944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415531/normal_60607db59b47a.pdfIn PDF document text
    • http://rasipafus.getenjoyment.net/text_to_image_gan.pdfIn PDF document text
    • http://dietnatur.fun/lendlease_australia_annual_report5tozu.pdfIn PDF document text
    • http://dakisemakegag.sportsontheweb.net/78706459114.pdfIn PDF document text
    • http://scoretdho.best/93501954162riq3b.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
    • http://dejupaxifitat.rf.gd/exemple_bon_de_livraison.pdfIn PDF document text
    • https://fc9a8e44-b853-4378-b933-957c6fa9ceda.filesusr.com/ugd/1da781_993a2bc4c81c472d900979afd0dfc4bb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/76478763308.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/zerizijuxojogipasapexuben.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/ardab_mutiyaran_movie_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/aggiornamento_android_10_xiaomi_mi_9t.pdfIn PDF document text
    • http://texegap.epizy.com/ms_sql_server_2014_management_studio.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_off000117b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B2 4996 bytes
SHA-256: cf0ba6589d303e7eab4587e2980e39e9dc7d000960d16015cb67940c62839bf3
font_01_sfnt_off000128c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C3 11200 bytes
SHA-256: 4902b6b5de494380ec0fc8b650bd4885a1bdbb76434b0ab038d1176cd1a93046
font_02_sfnt_off00014eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EEE 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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