Malicious PDF — malware analysis report

Static analysis result for SHA-256 0128ff99d3d650bf…

MALICIOUS

PDF

78.4 KB Created: 2021-03-29 04:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: ab37806d40027d7964f723c978bb4df0 SHA-1: d44d0f215232b456db001fd70fef168cc8edfcf5 SHA-256: 0128ff99d3d650bfd30c4ad0209eb730a921d59afd936ef33df25b84e8585695
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting, designed to redirect users. The embedded URL `https://jottigo.ru/award?keyword=ishihara+color+blindness+test+pdf` suggests a lure related to a color blindness test. While no scripts were explicitly extracted, the PDF structure and external URI firings strongly suggest a phishing or redirection attempt, likely delivered as an attachment.

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/award?keyword=ishihara+color+blindness+test+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374978/normal_6045102a139b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417423/normal_60267ea630d24.pdfIn PDF document text
    • http://minosijasif.mypressonline.com/fonamokelavo.pdfIn PDF document text
    • http://sun-italy.space/clicker_heroes_codes_robloxlflxh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415782/normal_601e4967c1577.pdfIn PDF document text
    • https://cdn.sqhk.co/vavewiren/dhgihkF/74089295955.pdfIn PDF document text
    • http://xelasurugopu.mywebcommunity.org/zegibakufasa.pdfIn PDF document text
    • https://cdn.sqhk.co/vagewovupug/Y7Ochd4/fogolesupefir.pdfIn PDF document text
    • http://bisituz.sportsontheweb.net/candidiasis_genital_masculina_tratamiento.pdfIn PDF document text
    • http://canonsburglake.org/world_war_z_ps4_gamegkgoj.pdfIn PDF document text
    • https://cdn.sqhk.co/senosekagoko/tTMSshg/52288521580.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421352/normal_6056a86e6282e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366627/normal_60466fae166f4.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/lowebemuwojiso/nasidelig.pdfIn PDF document text
    • http://taluxukuvasule.epizy.com/optex_bx80nr.pdfIn PDF document text
    • http://togalufunepobaz.rf.gd/best_3_ton_floor_jack_for_the_money.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/34220978872.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/zugufajaxojebel.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/cymatic_audio_utrack_24_manual.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_off0000f2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E1 5320 bytes
SHA-256: 09a1e280379fe7859c272b330038e3c201bdbc3b3ebbfa17380ae5afa745b3d5
font_01_sfnt_off000104e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E8 11548 bytes
SHA-256: b63549dd281b7639cb41d3c6313b074cdb86055e40a4a28f0f43847f82f62e60

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