Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9000635be1ae604…

MALICIOUS

PDF

80.6 KB Created: 2021-03-22 03:51:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c5360349fc724e388130e7df0621d209 SHA-1: 4ab9fda657f435e4d4c1caf7661251d31889fbf9 SHA-256: c9000635be1ae604ea6ab53a1245cb60a6a8f24f74ddee105426bfa318263925
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via the embedded URLs. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/123?utm_term=business+plan+template+for+microsoft+word PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4487186/normal_6007cb1d8d996.pdfIn PDF document text
    • https://bokavijuporuxeb.weebly.com/uploads/1/3/3/9/133997451/90b21b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491398/normal_6029e7d20ce1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375889/normal_6056af550e0d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470962/normal_60196ee906940.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465565/normal_6029851d89f8b.pdfIn PDF document text
    • https://mivifasev.weebly.com/uploads/1/3/1/4/131483453/5433154.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365584/normal_5ffcc4218e0ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469836/normal_60134625bdd40.pdfIn PDF document text
    • https://lobubanir.weebly.com/uploads/1/3/2/8/132814664/vejebumukesafazekew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426960/normal_604ce3af49e48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407087/normal_60392a138721d.pdfIn PDF document text
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/f1ef692ce6f871.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377647/normal_5fd8b501f225e.pdfIn PDF document text
    • https://kudarori.weebly.com/uploads/1/3/5/9/135960502/pufonuz_dafajatidoner_ginudu.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/bupaxomu/why_does_my_asus_monitor_says_hdmi_no_signal.pdfIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_6044ca1b2a4a438d9cc93cc36e067ccb.pdf?index=trueIn PDF document text
    • http://samajusinifako.atwebpages.com/kobibimoluviro.pdfIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/dragon_age_origins_mods_pc_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/why_did_the_age_of_absolutism_start.pdfIn PDF document text
    • https://e8ceee85-86bf-4804-80ab-d7a1511cbcf5.filesusr.com/ugd/38650a_277a14f08b2c4b13b98d813953f33661.pdf?index=trueIn 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_off0000fe56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE56 5444 bytes
SHA-256: cdc5d07669a812124ac1785a0a9b7648184670541a685c05d49e3ec394be5fca
font_01_sfnt_off000110d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D6 10356 bytes
SHA-256: deeb566d84dd5710f0f886bb0031859d8f3b79c1f80ed36fb0f4aecb7f1f9d38