Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9974e0d0d0df7ec…

MALICIOUS

PDF

66.2 KB Created: 2021-02-17 22:53:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4226e35419e8ec1d59a8edd1927b9f7b SHA-1: 6ed11ad9976036d1c2fd94bf088d61a349c3a750 SHA-256: c9974e0d0d0df7ec4671f690506830f445b239660f7366a53f5e9edfea4947f5
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm and uses suspicious links to lure users to potentially malicious domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to trick users into downloading further payloads.

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://seumenha.ru/strik?utm_term=norton+anthology+of+drama+volume+1+2nd+edition PDF link annotation
    • http://easylearning.space/fiwesif3lonu.pdfIn PDF document text
    • http://stavki-na-sport.site/25005583514k90l8.pdfIn PDF document text
    • https://runumoviw.weebly.com/uploads/1/3/4/8/134854062/tolutiverejufe.pdfIn PDF document text
    • http://xigujawuruwuko.22web.org/satitajowatuxadajejixobo.pdfIn PDF document text
    • http://awpmode.com/nhc_khiu_v_cha_cha_cha_khng_lih8lc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375203/normal_5fd635afbf211.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419424/normal_5ffdfcb716087.pdfIn PDF document text
    • http://ek-arenda.ru/turkey_hill_tripolitan_ice_cream_flavorsf33q1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477921/normal_60160312cc01c.pdfIn PDF document text
    • http://romeita.space/securities_commission_product_highlight_sheet8susm.pdfIn PDF document text
    • http://situbune.iblogger.org/lukopumum.pdfIn PDF document text
    • http://fredo.bike/animal_color_sheets1aak3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387412/normal_6016c85fb2a03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385204/normal_5fe5ddd488188.pdfIn PDF document text
    • http://securityofusersdevicesonline.site/new_york_times_acrostic_answersh1net.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393035/normal_5fe18a51b2ac6.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_off0000c3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AF 5460 bytes
SHA-256: 6c8b08ac51b4ddb211ae9aab9852909b565b63cc10809bc51bef5e9ba642343d
font_01_sfnt_off0000d635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD635 11376 bytes
SHA-256: 5fdfbed2ef7a39261d81d84b806ffeda76eacfa7accd9185c16b41c396835ee3

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