Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a1851742dee7c0…

MALICIOUS

PDF

72.2 KB Created: 2021-02-23 12:42:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: dc3b65b322f8f7efc1f1afc1aa994a15 SHA-1: 9e1b3e31d07370c13be00eac74a6a1922d92ae32 SHA-256: f0a1851742dee7c0243c5881c8fc2c3f4b118539f2bb2fffe05b5a395b2c7d65
166 Risk Score

Malware Insights

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

The PDF contains multiple suspicious and invisible links pointing to domains that are likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of numerous external links, some with UTM parameters, suggests an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://baarspo.ru/123?utm_term=what+are+the+types+of+system+in+system+analysis+and+design PDF link annotation
    • http://itchia.space/mobimugimivateohthb.pdfIn PDF document text
    • http://loginwithfb.site/what_cars_have_android_auto_2016vnq38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490364/normal_602c666d7b958.pdfIn PDF document text
    • http://pearhaidhr.fun/zokanijoxolapuloparvcsh.pdfIn PDF document text
    • http://copyrightsupportforlnstagram.com/vekelilrmdgw.pdfIn PDF document text
    • http://wide-take.top/wejexikukusiragisu1fm43.pdfIn PDF document text
    • https://cdn.sqhk.co/suxevevagova/DSjaWia/mini_world_craft_3d_builder_simulator_city.pdfIn PDF document text
    • https://cdn.sqhk.co/razulati/380jbjb/24543573149.pdfIn PDF document text
    • http://dlkmvkoenv.info/overhead_transparency_sheets_for_inkjet_printers4o8jx.pdfIn PDF document text
    • http://obzorov.site/monopoly_rules_doublesx5h14.pdfIn PDF document text
    • http://blacktea.space/922311645372uyqo.pdfIn PDF document text
    • http://appeal-ig.com/19701021026lbt2g.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/fezenur/jikomuxawefutabatu.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_off0000dd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD58 5568 bytes
SHA-256: 83e3836494f03d81a0163f09c7c776899fecd99553d98cf7e4cff3e88d28faf8
font_01_sfnt_off0000f035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF035 10224 bytes
SHA-256: b94689c09fcef402bb85edcba4ca3b374b6ab308e0656587edb4a0ad452ed2a8

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