Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc55d97d71537a03…

MALICIOUS

PDF

75.5 KB Created: 2021-03-30 06:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5bca1a10dac716f65c41036b0c204fe6 SHA-1: e8f6508ad9547a300f33b980e23c3a35fd7eb55b SHA-256: dc55d97d71537a0350c0a16162a5aba837febdc0e5344b79357ad806d30facfc
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to link farms hosted on disposable domains, indicating a phishing or redirection attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a link to known malicious redirector infrastructure. While no scripts were extracted, the structure and embedded links strongly suggest a malicious intent to redirect users to harmful sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=capitulo+1a-+b+answers In PDF document text
    • http://bimoriz.getenjoyment.net/goninira.pdfIn PDF document text
    • https://cdn.sqhk.co/posaleren/muijAOx/komotidevumasi.pdfIn PDF document text
    • https://cdn.sqhk.co/vojofarakiva/iggiNji/ketivepidodunitulepinat.pdfIn PDF document text
    • https://cdn.sqhk.co/gabixeme/ibFihjb/tudubamop.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/ehc3ua5/76324128760.pdfIn PDF document text
    • https://cdn.sqhk.co/giwumazusew/gelwHjf/snake_arena_2001.pdfIn PDF document text
    • http://ttttrrrr.space/wozazodurakurabagulelatpbfem.pdfIn PDF document text
    • http://praktika-ingenieur.com/graham_hancock_net_worth80ahv.pdfIn PDF document text
    • https://cdn.sqhk.co/wofikubid/acjhrgd/telegram_and_gazette_hometeam_sports.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367296/normal_6007df0060421.pdfIn PDF document text
    • http://haifaiv.ru/30050863405c5bex.pdfIn PDF document text
    • http://gopidap.scienceontheweb.net/endodontics_principles_and_practice_torabinejad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425913/normal_602227074de50.pdfIn PDF document text
    • http://pekibexuvipeve.scienceontheweb.net/what_a_wonderful_world_lyrics_and_chords.pdfIn PDF document text
    • http://rodisawikikofu.medianewsonline.com/cattle_production_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pikaderobiw.atwebpages.com/12873903222.pdfIn PDF document text
    • http://fazaburifug.myartsonline.com/logane.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_off0000e5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BC 5036 bytes
SHA-256: 0f93af9c4b8de523fe02939530497941c47da505f7cc2c0c1136cb66533c53e7
font_01_sfnt_off0000f6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FA 12396 bytes
SHA-256: 9c55a1a50501fd4b13a9dd69da454a646c0d58f24192774eb5abe692f08cd723

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