Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4203dfcf2440f48…

MALICIOUS

PDF

75.4 KB Created: 2021-03-23 01:57:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 95bf820a843b6abacc17659be95600ba SHA-1: ba792510d73bfc31cef8f91b8f7eaaea35416366 SHA-256: f4203dfcf2440f488806e1a7aa3af66dcd07ad44019fbd5fbd12f7210c5048a2
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to disposable hosting, indicating a link farm or phishing attempt. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to known malicious infrastructure. While no scripts were extracted, the structure and embedded links strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/award?keyword=basic+concepts+of+analytical+chemistry+pdf In PDF document text
    • https://mubuwejazanewa.weebly.com/uploads/1/3/4/5/134585617/gajepo-fuweseg-jajasab-sasenesox.pdfIn PDF document text
    • http://sexugaweguko.iblogger.org/gozejufuxutitonedulu.pdfIn PDF document text
    • https://nasavizar.weebly.com/uploads/1/3/5/3/135322571/zasipowose.pdfIn PDF document text
    • https://xumizobizuzu.weebly.com/uploads/1/3/4/6/134688834/1346044.pdfIn PDF document text
    • https://givetowa.weebly.com/uploads/1/3/1/4/131437183/xejawuxenizosoxe.pdfIn PDF document text
    • http://wibubalitobidu.22web.org/descargar_gratis_cambiar_de_a_word.pdfIn PDF document text
    • http://kovamuwaropepu.getenjoyment.net/66931401791.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/652910.pdfIn PDF document text
    • https://jeporifitev.weebly.com/uploads/1/3/4/2/134265357/koximupi.pdfIn PDF document text
    • http://tupujetu.sportsontheweb.net/complete_blood_count_procedure.pdfIn PDF document text
    • https://niwubeleligijoz.weebly.com/uploads/1/3/4/7/134764474/bf341f06c8025.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://koxowasone.epizy.com/bluetooth_receiver_for_bose_sounddock_series_2.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/wamapakuzumadebu.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/batman_arkham_asylum_joker_dlc_pc.pdfIn PDF document text
    • http://puwomuf.rf.gd/54715042529.pdfIn PDF document text
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_458e4c82772a49e7be51e299f20b28c2.pdf?index=trueIn PDF document text
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_f665ea8207624f928891bc41e4e894bf.pdf?index=trueIn PDF document text
    • https://6b52f5a6-db44-4d3e-8337-ab33c729cb13.filesusr.com/ugd/f4de5e_6a2f6cc8b8e8413b9136629e6b81c807.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/puzzle_and_dragons_mario_item_guide.pdfIn PDF document text
    • https://a97be2a3-bfb5-42de-bba9-b145341b31aa.filesusr.com/ugd/1f2860_69a5804471074c38ad783a138967a4c1.pdf?index=trueIn PDF document text
    • http://ramivomeduz.rf.gd/burger_king_dollar_menu_breakfast.pdfIn PDF document text
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_a3021e002ec64eaca8bdba77ee3e1eeb.pdf?index=trueIn 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_off0000e60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60A 5544 bytes
SHA-256: 88d1042ab953b714c296d36b4a637312bfb8367f303bad48690163bfe89a29e4
font_01_sfnt_off0000f8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C0 11996 bytes
SHA-256: 7619795891ed9c1d8a94c7fc80b46ca62f4c48e3ff778cf37edf06d6ebac25a5