Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6579bef555f98ce…

MALICIOUS

PDF

74.7 KB Created: 2021-03-16 23:01:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ca73e94e26549797d3670e0d6fbde053 SHA-1: 0cca1572d79fc984dd14198c51e8de2f31323ea1 SHA-256: f6579bef555f98ceef177b47dfd149648f5332151c159358bb5b137b474f335c
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 of which point to disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites, potentially leveraging embedded JavaScript for obfuscation or further redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/award?keyword=bitmap+to+pdf+converter PDF link annotation
    • http://driveformclanemilwaukee.com/99822322301ap317.pdfIn PDF document text
    • http://kpupnov.pro/how_to_repair_3ds_circle_padh1366.pdfIn PDF document text
    • http://hh666o.site/boot_camp_support_software_windows_7x22d5.pdfIn PDF document text
    • https://cdn.sqhk.co/posiraki/ehighig/nozusitizok.pdfIn PDF document text
    • http://phulop.store/sifibitifelomofilinidoksly.pdfIn PDF document text
    • https://cdn.sqhk.co/tipekafomube/bji7if4/xokevekekiv.pdfIn PDF document text
    • https://cdn.sqhk.co/vibebexez/kOhfgcN/digi_pay_commission_2020.pdfIn PDF document text
    • https://pipamoximiketo.weebly.com/uploads/1/3/0/9/130969724/niwovivirinanofukuk.pdfIn PDF document text
    • http://useplafond.xyz/5017847943e9w13.pdfIn PDF document text
    • http://duplicwcnj.space/guitar_songs_with_3_chordsyhzt4.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/I1gLjhY/notes_on_iphone_xs_not_working_after_water.pdfIn PDF document text
    • http://richmaya.site/togaf_9_foundation_study_guidel1hyi.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/zcQcia7/weapon_master_pathfinder.pdfIn PDF document text
    • http://sysfix.ru/virupoxafavirutadi54uv4.pdfIn PDF document text
    • http://ipai.online/nespresso_delonghi_lattissima_plus_capsulezxhd7.pdfIn PDF document text
    • http://creamwalls.space/bafefinolebitasovmzd6.pdfIn PDF document text
    • http://richmaya.site/diweruxarekfxume.pdfIn PDF document text
    • https://zumaraje.weebly.com/uploads/1/3/0/7/130776401/mirum.pdfIn PDF document text
    • http://vash-fasad.live/zeriwijulotazipuwitaluxk3lw.pdfIn PDF document text
    • http://csxmoney.info/what_does_the_raven_symbolize_in_the_bible35ten.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/mubemutolewe/zihale_masti_full_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/cardiff_university_map.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_off0000e7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FE 5200 bytes
SHA-256: 06599477f6869d1172052fcd7df04f8ce4f296e46210102268c8fcf666283508
font_01_sfnt_off0000f9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A7 10536 bytes
SHA-256: a97298bf4281f29945cfcaf3d0f6836c6808f24ec30f5c41b393d910c8ea87e5

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