Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d97419ae77049e…

MALICIOUS

PDF

74.5 KB Created: 2021-05-11 05:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: dc5c577ae8a05cbdd5303449e95bad1a SHA-1: 8495616dc6c4d4fb48184e986a10ff6062b3548a SHA-256: d8d97419ae77049e4f29d61dba6ad2c962c572745230f867d85d1a169257959a
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs, with a primary suspicious URL being https://jumiwimov.ru/strik. The document body, though heavily obfuscated, suggests a lure related to 'early arthritis in wrist', likely a pretext to drive users to the malicious site. No scripts were extracted, but the PDF structure and embedded URIs strongly suggest it's designed to redirect users to potentially malicious content.

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://jumiwimov.ru/strik?utm_term=early+arthritis+in+wrist PDF link annotation
    • http://lajijedevasure.iblogger.org/ecology_and_environment_for_ias.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463808/normal_605bdd25895dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447464/normal_60316998d15bb.pdfIn PDF document text
    • http://beach-fruit.fun/can_you_renew_your_ny_license_onlineh7289.pdfIn PDF document text
    • http://gukibipujuregof.22web.org/22738804085.pdfIn PDF document text
    • http://magazinrf.xyz/basirinudupuvivuccj1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480142/normal_600077ec09397.pdfIn PDF document text
    • http://sokepazetovul.22web.org/nipew.pdfIn PDF document text
    • http://raffle.website/39559305209u6j7v.pdfIn PDF document text
    • http://bepegut.iblogger.org/what_is_the_wps_button.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bapadukaf.epizy.com/96925467525.pdfIn PDF document text
    • http://wovoruvuluriba.epizy.com/medicinal_plants.pdfIn PDF document text
    • http://tefabonapo.rf.gd/45425118681.pdfIn PDF document text
    • http://xajumin.epizy.com/87241665281.pdfIn PDF document text
    • http://tepimajasajuk.epizy.com/tepiligunokamesuxagasa.pdfIn PDF document text
    • http://beduxuluwuniva.rf.gd/35601054344.pdfIn PDF document text
    • http://fosadexovoz.epizy.com/calypso_song_muzmo._ru.pdfIn PDF document text
    • http://julivaradisakit.rf.gd/wow_carbonite_5._4._8.pdfIn PDF document text
    • http://ledonapagemes.epizy.com/basic_dd_vs_add.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_off0000e63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63B 4924 bytes
SHA-256: 48e233a1325a88025e98c6ca5a86589ca8a95138b81de576b58fee683d50c436
font_01_sfnt_off0000f70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70A 11156 bytes
SHA-256: c846d9ed79210a2c481b76c51756f7918c3170a17f4b6884dd90ecfc4f833424

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