Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8d0e00b06e2633…

MALICIOUS

PDF

75.9 KB Created: 2021-04-21 00:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d10d93bfe9e5ed6b1883e4531540a433 SHA-1: 75bcd5214579a28b5fc291ef1b8ca30b31e6618d SHA-256: 4f8d0e00b06e2633a309822edb08dd84af57c2aba9f05dc44cbe4601248ce0bd
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to a domain associated with link farming and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document 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://seumenha.ru/strik?utm_term=common+core+state+standards+math+1st+grade PDF link annotation
    • http://jisuvakuwiraza.medianewsonline.com/robilepamatonumusubosuro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392871/normal_605ee18db149e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404308/normal_602b74f74e9e3.pdfIn PDF document text
    • http://kajejib.medianewsonline.com/gta_san_andreas_cheats_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406771/normal_5ff8044cb9fa0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450003/normal_603b143465374.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470016/normal_5ff8ae2499616.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455178/normal_5fd6460a28d17.pdfIn PDF document text
    • http://fibaxoxadomi.sportsontheweb.net/81472290353.pdfIn PDF document text
    • http://kutatit.getenjoyment.net/76509595863.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463543/normal_6057f3f3e175c.pdfIn PDF document text
    • http://bagomebefekixob.getenjoyment.net/tenarawoba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385004/normal_5fd16a5fc167f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382405/normal_6000b6ed87f07.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407795/normal_6007a40972b5a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://magegefopo.atwebpages.com/architectural_sketching_techniques.pdfIn PDF document text
    • http://fabedidatifi.onlinewebshop.net/26185471046.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/performance_budgeting_slideshare.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/79475087346.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/answer_key_csi_web_adventures_case_1_answers.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_off0000ec2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2F 5280 bytes
SHA-256: a5f8d6c250ba5c1be26056df3f4872d9fe4779d5cc52ba97e2e4d1199c3e6f4e
font_01_sfnt_off0000fdf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF2 10616 bytes
SHA-256: dd5d569a8ebe350db724f894c55c1f5d52ddc9263d1499e2be6ca5672b8c6060

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