Malicious PDF — malware analysis report

Static analysis result for SHA-256 11efc1fbac2f04d6…

MALICIOUS

PDF

80.9 KB Created: 2021-03-01 00:56:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c31ed271a9d8a592f1e6bd88649b35a8 SHA-1: 35a8121001cb11c7d92b5f43611058d1d61dbe8e SHA-256: 11efc1fbac2f04d66160ecf34b3e3b2a5d473b8677de22efc3cbfcee462d0a23
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

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://lozipotod.ru/wix?keyword=timplistas+canarios+famosos PDF link annotation
    • https://cdn.sqhk.co/mofijovelu/kSYiihf/bafijigofewaxetofilinajad.pdfIn PDF document text
    • https://cdn.sqhk.co/kososojog/hbjevig/72607940307.pdfIn PDF document text
    • https://cdn.sqhk.co/xonarewu/jihdCie/ratida.pdfIn PDF document text
    • http://trikolor.site/82160470708dpvqs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481825/normal_600b519d9cbd9.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzinipaz/hQWhaN1/runib.pdfIn PDF document text
    • http://avit0.pro/mutizubugilarayknp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406787/normal_5ffcb2d5e699b.pdfIn PDF document text
    • http://nakidki-alkantara.xyz/4674980920272vs.pdfIn PDF document text
    • http://money-team.site/romeo_and_juliet_act_2_worksheet1djko.pdfIn PDF document text
    • https://cdn.sqhk.co/kurinunuwor/8mYdjfE/12803108116.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443799/normal_60339fa3950e1.pdfIn PDF document text
    • http://load-bcp.com/corrugated_sheets_48_x_966fmpz.pdfIn PDF document text
    • https://cdn.sqhk.co/genamudazunu/YifhgTB/bilezozosuv.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/jjjbgiy/luxof.pdfIn PDF document text
    • http://sberbank.services/get_police_report_chicago87hji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477139/normal_5fe2ba73585a1.pdfIn PDF document text
    • http://itdiscounts.pro/14478612822rbwpm.pdfIn PDF document text
    • https://cdn.sqhk.co/baxalelizop/WaidXnr/membranous_labyrinth_anatomy_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/nasubivapu/df6ijia/97795275684.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000fd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD47 5112 bytes
SHA-256: db6e68aef9e0f17f6c774bb13262c581434e219604c7646a0b203cc49d10cab8
font_01_sfnt_off00010e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8F 11820 bytes
SHA-256: e4ea7ac7065cc57d7434dc4e03fea0668ba80b322b200cc389d14f01feb082dc

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