Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82e627478533f90…

MALICIOUS

PDF

80.4 KB Created: 2021-05-06 00:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 86d24a012089e6d8845b1dccb5d33506 SHA-1: 65c3355cf8c350001ea14cc4465b3f5cfe39b64b SHA-256: f82e627478533f9056c17721d0ae928218e2ba929c98a3fccf723c5338af4e19
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('jottigo.ru') that is likely part of a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a malicious intent to use disposable hosting for link farms. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classification strongly suggest malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/strik?utm_term=what+causes+refrigerator+water+dispenser+to+stop+working PDF link annotation
    • https://cdn.sqhk.co/pigexebobe/iajihez/arkadelphia_walmart_automotive.pdfIn PDF document text
    • http://fatimuze.22web.org/catechismo_della_chiesa_cattolica_compendio_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/kovutego/ijUibhg/street_fighter_5_apk_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/naveropifo/iahhkgi/97067546026.pdfIn PDF document text
    • https://cdn.sqhk.co/rowagana/jZXXghg/60746131066.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/orion_cooker_times_turkey.pdfIn PDF document text
    • http://dusibarupuguli.medianewsonline.com/jamejujoremig.pdfIn PDF document text
    • http://zuduwamani.mypressonline.com/cmake_tutorial_linux.pdfIn PDF document text
    • http://vumejopiraxu.mywebcommunity.org/past_simple_exercises.pdfIn PDF document text
    • http://zulesaxeririv.sportsontheweb.net/60632268425.pdfIn PDF document text
    • http://japamawosoj.mygamesonline.org/alveolar_bone_grafting.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://wudemexa.myartsonline.com/40770666441.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ab973c9-19fb-41fc-bcd3-471445b1fd08/40561586997.pdfIn PDF document text
    • http://lijizuzinarit.epizy.com/19674012390.pdfIn PDF document text
    • http://gevejonitu.onlinewebshop.net/asustek_p8z77-v_lx_specs.pdfIn PDF document text
    • http://sulumasofip.epizy.com/adventure_story_books.pdfIn PDF document text
    • http://senesijosezetu.myartsonline.com/what_is_informational_power_in_leadership.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12ed2fbf-3cc7-46f0-8dc6-fca7bf871365/darkness_too_visible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfd7d103-7fd0-425a-853d-08cd1fd8a10d/19499040247.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21a90af3-e44c-4eef-87ae-e7ee99a58c0f/casio_wave_ceptor_4303_instruction_manual.pdfIn PDF document text
    • http://jipopoj.rf.gd/ximefomifaviwilorux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4917086-27b2-466b-8639-44cfd2d27bfb/26382116524.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_off0000efd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD1 5436 bytes
SHA-256: f692e1c0470bb12cbc64489c428988d10140d7cc1b3135b363e5b5601c978c08
font_01_sfnt_off00010261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10261 10324 bytes
SHA-256: eda3a36b7b3f577d4f38fa15d266ae82f905b4c646aa2d48df7d2059fb515dbe
font_02_sfnt_off00012553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12553 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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