Malicious PDF — malware analysis report

Static analysis result for SHA-256 af22d6301b00f5cf…

MALICIOUS

PDF

70.6 KB Created: 2021-03-22 18:01:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 828b7e76ec9083d8449186c4c6135304 SHA-1: 1cd63c93251325b8a0269813b5a48bbb67cc6e7f SHA-256: af22d6301b00f5cf4e24899fc31ecc1378dd5a0f1bcabea995c87c59b8330cd8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or redirection scheme. The presence of a URL with a 'utm_term' parameter suggests a phishing or marketing lure. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its structure and embedded content designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/strik?utm_term=coby+mp3+player+mp620-4g PDF link annotation
    • http://nobukuxokosiga.mypressonline.com/iota_amharic_bible.pdfIn PDF document text
    • http://bumufirila.mygamesonline.org/87366602237.pdfIn PDF document text
    • http://arfeshome.com/bujajenajuxomosusunuzujad28ed9.pdfIn PDF document text
    • http://sdfafq.info/19762700366djxjp.pdfIn PDF document text
    • http://daxavepevepa.mypressonline.com/tawodafozapufodilebusu.pdfIn PDF document text
    • http://lozhobelir.space/71561548272idx5i.pdfIn PDF document text
    • http://fisareboveda.getenjoyment.net/juporiruvupupademupawiweg.pdfIn PDF document text
    • http://donolemovune.mypressonline.com/atomic_emission_spectroscopy_principle.pdfIn PDF document text
    • http://nikaold.site/33415135796bb1fj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_89d648a02b1647ad93414f3df3258909.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/4760588096.pdfIn PDF document text
    • https://c8d0f166-86fd-441b-8df5-aa5e6c6c7644.filesusr.com/ugd/f4b3af_ff00d255ea354935a4386211b274e427.pdf?index=trueIn PDF document text
    • https://b73db3ac-2e3c-475a-83ab-7f4668f00a8f.filesusr.com/ugd/80e8fa_2a8e70ff6de947d09322da7baf4475f0.pdf?index=trueIn PDF document text
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_291b59377178419b82cae8161fe6abbd.pdf?index=trueIn PDF document text
    • https://5f384421-c3d0-4b4c-85a6-d3745974446f.filesusr.com/ugd/40006b_2eafaf97219843aaa65e8935dc7c2942.pdf?index=trueIn PDF document text
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_3690d7fc19fb47fe85c8847b6cc7120d.pdf?index=trueIn PDF document text
    • https://fdb4f28e-c637-431f-967d-457feef73efb.filesusr.com/ugd/cf5aa9_33938f3e9cb2452699bbbc6a2d877f85.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/divexikav/html_hidden_form_auto_submit.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/4915945150.pdfIn PDF document text
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_fe0365df6e2643d9985606793f4b5546.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/1521971654.pdfIn PDF document text
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_3ad8c6f0c103404ea47d536e3f35a29d.pdf?index=trueIn PDF document text
    • https://2aa89031-56ac-4de1-b828-aabe99840ec8.filesusr.com/ugd/cf14a4_96489ab021274b9f9502870ccc1cd44b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/english_grammar_practice_exercises.pdfIn PDF document text
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_3490a4f528aa4f68a7e072f262f8a659.pdf?index=trueIn 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_off0000d4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C8 5820 bytes
SHA-256: d6761bf5d5a061f644d6200d3dd5bc5515c4e0a757b751128590eefaffad9d8a
font_01_sfnt_off0000e897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE897 10604 bytes
SHA-256: d4d60e28ea5b42ddabab8cff5a72f16bb7bcdbfe4e47faf980922ee9e8200aac

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