Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5095c75e72adb32…

MALICIOUS

PDF

83.8 KB Created: 2021-03-31 00:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ac89d28ac84525ebea5a9fb797d8492c SHA-1: 0cbbca285f51bccd840d72ce2998e86905d50e0b SHA-256: f5095c75e72adb32db9ffcfcb87c9828ad75309472cf343a5bca15923f883f18
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'ponafet.ru', suggesting it's designed to redirect users to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is part of a link farm on disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/wix?keyword=define+each+of+the+following+terms+data+field+record+file PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4462992/normal_5fdf58567fa03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458616/normal_6051434a52664.pdfIn PDF document text
    • http://uscarinsurance.info/resumen_de_la_biblia_catolicau6qjl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478146/normal_5fd160ae0c9a7.pdfIn PDF document text
    • https://wufisosudima.weebly.com/uploads/1/3/0/8/130874090/9902072.pdfIn PDF document text
    • https://fuzobiwi.weebly.com/uploads/1/3/4/7/134717163/sabivopujaxagis.pdfIn PDF document text
    • https://zanewodibamejat.weebly.com/uploads/1/3/0/9/130969445/e30645d28a49b9b.pdfIn PDF document text
    • https://lulitetuxopibol.weebly.com/uploads/1/3/1/1/131164377/7f348208423c83.pdfIn PDF document text
    • http://gnfcns.info/medieval_2_total_war_money_cheat_codeqewor.pdfIn PDF document text
    • http://topsalon.xyz/940087532231d2xi.pdfIn PDF document text
    • https://nepazumikad.weebly.com/uploads/1/3/5/9/135958915/limaranumuzeg.pdfIn PDF document text
    • http://fly-drive.online/commonly_confused_words_exercisesjf8dl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473916/normal_60197559441aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461229/normal_600b6c29c1571.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417403/normal_6006aff021f7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465393/normal_603a25ef0510c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370064/normal_5fe46a1623ee0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b57695f-e3e5-4c55-96d1-085833cedd92/72848722028.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/what_the_purpose_of_a_mortgage_deed_witness.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/88219025601.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1011cc2-4c16-486d-8ff0-20f00cf578c8/roreveliludepumopoxuxeka.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_off000108cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CB 5524 bytes
SHA-256: 4c80270367c43f49940aa02ec7e279fa5318e67b7f4a4ff33c57195caf02028a
font_01_sfnt_off00011b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B86 10936 bytes
SHA-256: ea254e8fa35951541c3a4ac0dce1a6da3ce938a28d4cf7f55e4111d60db394e4

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