Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6236f9c8015cc2…

MALICIOUS

PDF

74.1 KB Created: 2021-03-21 05:23:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6c733583f9c55102e3f5e7041efdb70c SHA-1: b05623218c0b871aa8863eca90d162bca92daf02 SHA-256: 5b6236f9c8015cc264d47bbb265d5e7e35eb9d4a60e661321c1debc2c2f8571c
184 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The embedded links, such as 'https://crophysi.ru/award?keyword=alexander+hamilton+lyrics+pdf', are designed to redirect users to potentially harmful websites. The document body contains garbled text, suggesting it is not intended for legitimate user interaction but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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/award?keyword=alexander+hamilton+lyrics+pdf In PDF document text
    • http://pufivuziviv.mypressonline.com/business_analysis_plan_template.pdfIn PDF document text
    • http://sugakibabusu.scienceontheweb.net/ataxia_de_friedrich.pdfIn PDF document text
    • https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/1629939.pdfIn PDF document text
    • https://cdn.sqhk.co/purilusevike/hnvcvhc/barber_appt_app.pdfIn PDF document text
    • https://cdn.sqhk.co/zojoguxuban/ejhjgXM/nojopusege.pdfIn PDF document text
    • http://xazowagef.mypressonline.com/balalaika_chords.pdfIn PDF document text
    • https://zafitageleg.weebly.com/uploads/1/3/4/4/134489703/6768270.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/9jdgdhb/layton_brothers_mystery_room_unlocked_apk.pdfIn PDF document text
    • https://vubufogos.weebly.com/uploads/1/3/4/7/134766152/4aaed2e151ace3.pdfIn PDF document text
    • http://midesamipazizuj.scienceontheweb.net/30864580300.pdfIn PDF document text
    • http://filitopalanima.22web.org/83172408149.pdfIn PDF document text
    • http://kexedeziferu.sportsontheweb.net/how_do_i_regenerate_my_water_softener.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/7779871526.pdfIn PDF document text
    • http://ruxipivufaditij.22web.org/32758645377.pdfIn PDF document text
    • http://wepijafiguwenan.mywebcommunity.org/revista_o_boticrio_ciclo_9_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/tisumusef/tibhdhe/32572288665.pdfIn PDF document text
    • http://zegererevez.medianewsonline.com/25655036508.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nupakavidowux.epizy.com/30063203532.pdfIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_fd934d52a1534a25a4ad69e367d909d0.pdf?index=trueIn PDF document text
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_83883edc40ac4e23b4247cef8b64e4ac.pdf?index=trueIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_bbffbfe77a11466891151839af2c300e.pdf?index=trueIn PDF document text
    • http://parubixus.rf.gd/past_simple_irregular_verbs_exercises_with_answers.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_off0000e268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE268 5556 bytes
SHA-256: 0aca3332d24f6f772bfc1783bcd1826b923b7b3da4405ad0588334b495d904bb
font_01_sfnt_off0000f52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52E 11204 bytes
SHA-256: 0fb815bc722c2c887ddf496e75e09406449fdfd08f61bd7a68b8ce2be5752e5e

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