Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ed53de0b2109e7…

MALICIOUS

PDF

78.8 KB Created: 2021-03-12 00:58:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: cb4c9161a44131029df5e0316979250f SHA-1: 92fde87f55378b367fe6491a4b079e1fc42f7256 SHA-256: c4ed53de0b2109e72f63b83caaa7834211c90ca63d81526d7b6e90c7ab22cb01
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host malicious content. The presence of external URIs suggests the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/award?keyword=federal+supreme+court+cassation+decision+volume+18+pdf PDF link annotation
    • https://fanamavikere.weebly.com/uploads/1/3/4/6/134610997/mepim.pdfIn PDF document text
    • http://runavowof.22web.org/33438270537.pdfIn PDF document text
    • https://teraxumafelenug.weebly.com/uploads/1/3/4/7/134747654/cf6cf89046ec23.pdfIn PDF document text
    • https://dogodomob.weebly.com/uploads/1/3/4/0/134017369/rowakanefipiw.pdfIn PDF document text
    • http://tijudiwulewanuw.getenjoyment.net/nemubijofimabexalegof.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/66315446261.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/jovidofutaxofemerakobije.pdfIn PDF document text
    • http://tatuxuvoziparu.mywebcommunity.org/nerapito.pdfIn PDF document text
    • https://luvisusarav.weebly.com/uploads/1/3/6/0/136011852/212d927c.pdfIn PDF document text
    • https://tifogufa.weebly.com/uploads/1/3/1/6/131637606/18418a784c8bf.pdfIn PDF document text
    • http://zawugexoj.22web.org/89483471733.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
    • http://wutogiku.epizy.com/datonozuvobezewo.pdfIn PDF document text
    • http://sejabozewilobog.epizy.com/fonape.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/dark_souls_remastered_mod_menu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef395221-8a1b-47b6-aa18-70c94b497b89/how_much_does_a_butterbeer_cost_in_harry_potter.pdfIn PDF document text
    • http://gofeneneju.rf.gd/uber_case_study_marketing.pdfIn PDF document text
    • http://modefumagija.epizy.com/71480784758.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/how_to_cook_a_prime_rib_on_a_ronco_rotisserie.pdfIn PDF document text
    • http://gukojubare.rf.gd/48209365653.pdfIn PDF document text
    • http://bajejefi.epizy.com/derry_nh_police_incident_report.pdfIn PDF document text
    • http://mekasesajiw.onlinewebshop.net/befawujaxakuwe.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_off0000e7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CE 5444 bytes
SHA-256: 4cb2e3098581ff96136654f6ea0c186b01fa6010ee5b57fbd9ae91fe2f6c4383
font_01_sfnt_off0000fa46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA46 10888 bytes
SHA-256: ed4728679066ffabc1a66dd5b4998a39792d90e980f12b24a1f3e67c175a4106
font_02_sfnt_off00011f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4B 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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