Malicious PDF — malware analysis report

Static analysis result for SHA-256 8636c15750508738…

MALICIOUS

PDF

164.1 KB Created: 2021-01-02 17:23:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2f4eb0c9775703990ebe44466ca10abf SHA-1: d829d5eca6ac374adcf1d9ef8c0b9090735d0967 SHA-256: 8636c157505087388b41dadf2308470905e95fbb061160080d796bda3a08c39e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links pointing to suspicious domains, identified as a link farm on disposable hosting. One critical heuristic indicates a direct link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

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
  • 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 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://ggtraff.ru/123?utm_term=pleasant+hill+elementary+school+scarborough+maine In PDF document text
    • https://cdn.sqhk.co/xinulezebi/ihyAIgi/90849635104.pdfIn PDF document text
    • https://cdn.sqhk.co/losokifape/Tghshge/marktplaats_app_downloaden_laptop.pdfIn PDF document text
    • https://wofovadorobonam.weebly.com/uploads/1/3/0/7/130739883/vopabob_gipidit.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluzezufe/gdFhe57/fishing_break_game_cash.pdfIn PDF document text
    • https://rokufekajo.weebly.com/uploads/1/3/0/8/130814342/2b596d20.pdfIn PDF document text
    • https://zugudomumomaxix.weebly.com/uploads/1/3/5/3/135324912/3890695.pdfIn PDF document text
    • https://wamedota.weebly.com/uploads/1/3/0/8/130814674/1506447.pdfIn PDF document text
    • https://kelobutino.weebly.com/uploads/1/3/0/9/130969458/ab8c589.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lunojol/71944878029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1071cf70-f580-44c5-8eec-a87a17ff1da5/hydraulic_jack_repair_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87a8d5de-bfea-4612-8c10-68f28a981911/jafigebus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b75ded4d-5a97-421d-ba2d-18565e668f3a/jijawuvukaxaja.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_off00024a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24A48 5456 bytes
SHA-256: f89834f2c6fa569b0b287e033ba5d80f75f529583a7504dc7433d9ea1440993e
font_01_sfnt_off00025cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25CB9 11536 bytes
SHA-256: 658769116ef4b4ba344a2ba85eab872936ecff272e8c8a2bbb2021c7d6317082

Open this report in the interactive analyzer, or submit your own file for analysis.