Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d8d085fb017e141…

MALICIOUS

PDF

117.3 KB Created: 2021-04-26 01:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8ac042549b6a44b36143a3766f7e3c8c SHA-1: 69f0675720da9a18cdd7954291e034f0573c7b4f SHA-256: 0d8d085fb017e141a29500cbded07f52c752216f2c705a3f03bf0cf80544afa5
184 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The PDF contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier also strongly flagged this PDF as malicious.

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
  • 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://dafemum.ru/strik?utm_term=co2+laser+power+supply+diagram In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388824/normal_6035b65f296fa.pdfIn PDF document text
    • http://goodik.fun/badger_insinkerator_500_manualm2pit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402933/normal_5fd5f592e7b33.pdfIn PDF document text
    • http://toxipoxekej.medianewsonline.com/business_plan_for_online_shopping_website.pdfIn PDF document text
    • http://xiletunekukine.iblogger.org/bioconversion_microorganismes.pdfIn PDF document text
    • http://dvestideyli.xyz/ncees_fe_handbooka47hp.pdfIn PDF document text
    • http://tehnopolis.org/silicon_valley_bank_addressizdfh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383146/normal_5ff608eb264c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410191/normal_5fe7444bc9450.pdfIn PDF document text
    • http://mavafesumej.medianewsonline.com/45389531965.pdfIn PDF document text
    • http://newipufisatag.scienceontheweb.net/tagodikalefesup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuragumok.atwebpages.com/neoliberalism_policies.pdfIn PDF document text
    • http://gotenekopibijo.epizy.com/69433310226.pdfIn PDF document text
    • http://vifidumefitur.atwebpages.com/rick_steves_italy_ebook_download_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57b9a78c-fd52-4b5a-8aea-2141247988d0/how_to_see_z_value_from_table.pdfIn PDF document text
    • http://vonubopoz.rf.gd/how_to_air_up_a_coleman_hot_tub.pdfIn PDF document text
    • http://marenoko.epizy.com/zotolawatuxukuzuxuges.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22b55ea3-a9b8-48ca-b48c-09ae08807547/1753689719.pdfIn PDF document text
    • http://lurarapekakaka.atwebpages.com/16573336016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c863aae-d1ed-4e78-b496-8e647fde643b/69613108810.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_off00018ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EA2 5512 bytes
SHA-256: bd6c14acbb0621d4beeed068e7f5abb0905f038183d1b29e23ec6c9d67ff745e
font_01_sfnt_off0001a15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A15E 11224 bytes
SHA-256: 3e1b30108f365206e73ce94567cdc49914ad0377745e7a05c00d217bbd66cfc3

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