Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a1aeb3ea0e574db…

MALICIOUS

PDF

76.9 KB Created: 2021-02-19 06:56:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f31d0fcd88887e86b7987138778b8cf9 SHA-1: 3338798dfa93381a89786c47b22e8d4d38334bfe SHA-256: 1a1aeb3ea0e574db57d636449ee76a92c151b43bddd7065b98e1a3affa37232d
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to obscure the true malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, suggesting the document is a lure to a malicious site.

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://maypoin.ru/strik?utm_term=stretching+exercises+for+plantar+fasciitis+youtube PDF link annotation
    • http://supunagoto.22web.org/21737302884.pdfIn PDF document text
    • https://cdn.sqhk.co/jefapukawore/iiacKPz/tank_war_machine_live.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388842/normal_6025c3927faf5.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/B5Znhi9/82885780038.pdfIn PDF document text
    • http://ludshop.xyz/pifuvinivusajavosnhh9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369522/normal_6007eceddbe82.pdfIn PDF document text
    • http://bewugexujiz.iblogger.org/arabic_calligraphy_fonts_free.pdfIn PDF document text
    • http://kexagatedonekun.iblogger.org/fezarogijov.pdfIn PDF document text
    • http://nowatora.22web.org/tijixa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lugimes.epizy.com/38643672390.pdfIn PDF document text
    • http://fubegamo.epizy.com/lejakakebimufulejavusimiz.pdfIn PDF document text
    • http://reroxiki.epizy.com/dutirenidibikuwelusub.pdfIn PDF document text
    • http://najorenowodume.epizy.com/music_sheet_stand_organ.pdfIn PDF document text
    • http://mudoxaw.epizy.com/emulator_gba_pc_free.pdfIn PDF document text
    • http://kusegewamuzazod.epizy.com/wonaxesunitemisi.pdfIn PDF document text
    • http://vometavofol.epizy.com/wesefenalufu.pdfIn PDF document text
    • http://ziwebizivag.epizy.com/ziwemumufekesazirudo.pdfIn PDF document text
    • http://tupomomi.rf.gd/fairfax_girth_size_guide.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_off0000eea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA0 5692 bytes
SHA-256: 65785e66950ce4c58c3cd46efde50f68209f2652bdaaeabb96f27819e38bfc9a
font_01_sfnt_off0001020d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020D 10612 bytes
SHA-256: 550ea0c7831ce9f281f5619ab145781fe2df35071cff524dc85b593d256e99bf

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