Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c53954fc95fa9e2…

MALICIOUS

PDF

97.1 KB Created: 2021-02-15 18:16:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 8bdc907811e96c6caa825d134cbd5a4f SHA-1: 58b051efccce1f7d317da3687c1afabd535b653e SHA-256: 0c53954fc95fa9e290f2a43c256cf7261a62625c06f5b74c2d83d702125f87a5
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains a large number of embedded links pointing to various PDF files hosted on disposable domains and link farms. This behavior is indicative of a link farm or phishing campaign, designed to redirect users to malicious content or potentially exploit vulnerabilities. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=mitologia+griega+diosas+nombres In PDF document text
    • https://gewewipuno.weebly.com/uploads/1/3/0/7/130775766/figog.pdfIn PDF document text
    • http://zafotebobivet.iblogger.org/chute_de_tension_cable_formule.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527859/normal_5ff0376be0bd2.pdfIn PDF document text
    • http://bobr.space/vision_ias_current_affairs_december_2018_downloadma50e.pdfIn PDF document text
    • https://xajimago.weebly.com/uploads/1/3/0/8/130813364/c3964eeb2.pdfIn PDF document text
    • https://todumubisopid.weebly.com/uploads/1/3/5/3/135312552/7eacdbeb.pdfIn PDF document text
    • https://mafetoga.weebly.com/uploads/1/3/0/8/130874134/sebubenikejelomogi.pdfIn PDF document text
    • https://lumodafudewose.weebly.com/uploads/1/3/4/4/134480169/3862619.pdfIn PDF document text
    • http://topvideo.design/jatadimijakefukids4c6p.pdfIn PDF document text
    • https://totorososine.weebly.com/uploads/1/3/4/8/134892144/sesogozabomusa_getexolef_sakemujomuri_kikijukufanupul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454172/normal_5fd0703061142.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495684/normal_5ff002ee5fb44.pdfIn PDF document text
    • http://salleapp.xyz/definisi_animismetjyag.pdfIn PDF document text
    • http://hydrofthol.space/guguwuriwolisupojazoxi07m.pdfIn PDF document text
    • https://kevefizi.weebly.com/uploads/1/3/1/8/131871405/82c89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387411/normal_5fd77914b214c.pdfIn PDF document text
    • http://armada.technology/294066050688mg4o.pdfIn PDF document text
    • https://tupemewona.weebly.com/uploads/1/3/0/7/130775182/madowoxiga_nomomapivubagi_jutalitorezo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388156/normal_5fdf651e13203.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_off00013b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B44 5292 bytes
SHA-256: 56a165db1925db8af5612613ef7ec7dfd426e6822872475b30b46815bf679980
font_01_sfnt_off00014d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D2F 12352 bytes
SHA-256: 8ca6ff778e0c2b11d70a6a1cb3dbeb477cdb70a7430d454d81eddbdda19f18f6

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