Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c0c368cfc3b9ce…

MALICIOUS

PDF

77.7 KB Created: 2021-03-28 00:23:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 77f441d1839ed2397f6ba7a84f1351ea SHA-1: a65f72a037ae013418c9c36393a9f46c2be44087 SHA-256: 76c0c368cfc3b9ce1710984431f21af1f9b9a7ecedce660ee7c9fced40722580
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with critical heuristics indicating that these links point to known malicious redirector infrastructure and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure itself implies an attempt to redirect the user to malicious content.

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
  • 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://crophysi.ru/aws?utm_term=windows+monitor+hotkey In PDF document text
    • https://ditakusoboke.weebly.com/uploads/1/3/1/4/131437623/semikalag.pdfIn PDF document text
    • https://kujadivenudeku.weebly.com/uploads/1/3/5/3/135324903/2502650.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493888/normal_5fe92cd9be897.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458150/normal_60491541ed284.pdfIn PDF document text
    • https://teraludejos.weebly.com/uploads/1/3/5/3/135304334/937640d6c.pdfIn PDF document text
    • https://xerutofen.weebly.com/uploads/1/3/4/5/134578778/puzalebilis.pdfIn PDF document text
    • http://prodive.su/41969729433m6ko3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453142/normal_5ff64a22d5456.pdfIn PDF document text
    • http://trickyturkey.com/steam_inventory_calculator_cs_go2ae5n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450731/normal_603175fdda591.pdfIn PDF document text
    • http://onlyforyou.space/punepofobal4ogiy.pdfIn PDF document text
    • http://shop-profildoors.ru/6551385202644p13.pdfIn PDF document text
    • https://rulovuwupe.weebly.com/uploads/1/3/5/3/135386045/ee2f8248254d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378404/normal_5ff82a1d19654.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410016/normal_5ff261c5ac96b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f8a8f9c-0815-47b2-9fda-b0465e36f7f1/libro_el_hombre_ms_rico_de_babilonia_descargar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e2e51bd-554a-43a7-b5f2-013b57ea461c/ap_style_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e5514dc-c5e4-49df-bc5c-799f74276347/bowufimusipexew.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_off0000f21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21C 5096 bytes
SHA-256: 9dc6055efcb9c40c4be76d6f469385693a8db2863d4e2a4607932d2236247a6e
font_01_sfnt_off0001035f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035F 11120 bytes
SHA-256: 105eac56e5ebd836a72d0dbe2ccdd4fcf930a24f0170a91cb2da5c152b31cd90

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