Malicious PDF — malware analysis report

Static analysis result for SHA-256 c477cdced7580704…

MALICIOUS

PDF

74.9 KB Created: 2021-02-16 22:45:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b1f9e47edd34db4da1e5f210efaa892f SHA-1: 8e353f898d23e94800f989be53e630f3ef3cf97f SHA-256: c477cdced75807042a73e8e45cfa2290492fa3a292a088be95796dadea6e5560
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a link farm on disposable hosting and a high ML classifier score. The embedded URLs, such as https://jacksth.ru/strik?utm_term=paired+sample+t+test+table+apa+style, indicate a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

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://jacksth.ru/strik?utm_term=paired+sample+t+test+table+apa+style PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4488815/normal_5ff531caf1070.pdfIn PDF document text
    • http://helper-badges.com/26005798777zhz3e.pdfIn PDF document text
    • http://cashtanks.fun/merifuwebuduturadokatirenflmz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392474/normal_6005902e53c36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392661/normal_5fcdbdaf17c72.pdfIn PDF document text
    • http://grusha.space/78855325481g6g8v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374535/normal_601c6398ba9dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456391/normal_6029c4c4c745b.pdfIn PDF document text
    • http://monstergym.ru/69170844795edpfq.pdfIn PDF document text
    • http://anarchymedya.com/reflection_mulan_piano_sheet_music7opl2.pdfIn PDF document text
    • http://mosquito.codes/181039979313pf8v.pdfIn PDF document text
    • http://characduwe.space/80081916235c74f8.pdfIn PDF document text
    • http://pop-marketplace.ru/jugiwejozupegezotisavokebryrl0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450640/normal_600a069c261aa.pdfIn PDF document text
    • http://avtovishki-msk.ru/homophones_worksheet_for_2nd_gradecle01.pdfIn PDF document text
    • http://alcexpress3.xyz/comcast_channel_guide_fox_business_networkb8kdg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jejulurowev/dundas_peak_color_report.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/chapter_1_personal_finance_an_overview_answers.pdfIn PDF document text
    • http://palipesokugukux.epizy.com/ponomifukipomuwap.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5F 4920 bytes
SHA-256: 43d51b33b0a8bc9ca7ea3b87da6315314af18ef555ce7ccea9b70b2cc8d586e4
font_01_sfnt_off0000ec0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0F 10516 bytes
SHA-256: da2290711ea2b2817b7a87bafd933b77821a4a60603b01ab9c9c4fba289e8d9f
font_02_sfnt_off0001100e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100E 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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