Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21d26e3559472b4…

MALICIOUS

PDF

83.9 KB Created: 2021-05-17 04:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3246ca7b1a936c29645692a9b29031af SHA-1: 6fea4c172ca26e17ba64300f71e3db641d0da55b SHA-256: c21d26e3559472b44a20c5362fb00d1d31ce4481b75295f9ab0d08679f9f74f7
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain (`botokaw.ru`) that appears to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a technical lure related to 'MSI 970A-G46 RAM problem', likely intended to trick users into visiting the malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://botokaw.ru/strik?utm_term=msi+970a-g46+ram+problem PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450350/normal_5ff16b14c7006.pdfIn PDF document text
    • http://vizabofunedaj.22web.org/actionable_information_en_francais.pdfIn PDF document text
    • http://copyrightsupport-ig.com/old_navy_covid_protocolsddsp2.pdfIn PDF document text
    • https://cdn.sqhk.co/rusobotakox/hcSFia8/best_hockey_fights_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/zosiwutu/g3AfP42/charles_v_holy_roman_emperor_facts.pdfIn PDF document text
    • https://cdn.sqhk.co/kefekawit/ehdiell/832719526.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379744/normal_603a56cf176c3.pdfIn PDF document text
    • https://cdn.sqhk.co/zadexona/jhcnhjU/ice_cream_and_cake_birthday_cakes.pdfIn PDF document text
    • http://1s.london/mhxx_cia_megagbvix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428062/normal_604b032b2a98a.pdfIn PDF document text
    • https://cdn.sqhk.co/nanubebebot/28pOsbS/color_by_number_online_animals_for_adults.pdfIn PDF document text
    • http://italy50wow.pro/cost_of_living_raise_2020b61gk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367297/normal_5ff7d5c43b9c6.pdfIn PDF document text
    • http://bogavevi.22web.org/concierto_de_aranjuez_sheet_music_piano.pdfIn PDF document text
    • http://ses-sanobrabotka.ru/183366265423cue9.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/2b185e88-6a65-49de-b00a-d5cb69db5742/honda_civic_service_schedule_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25020b16-7746-49f9-b825-c3040d13de47/jedovedebetokavikanoxegid.pdfIn PDF document text
    • http://rasunafosav.epizy.com/iflytek_co._ltd_annual_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05a91a7d-2dc6-4b6a-8683-2aed5d0d125d/oster_hand_blender_smoothie_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d80d3daa-a72a-4bb8-a8c0-b7bb45f0f4cd/xutazagor.pdfIn PDF document text
    • http://juxenemijoguku.rf.gd/bojapuvila.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/671edcb4-c235-4d63-a88b-d836297fdaa6/dipez.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DC 5936 bytes
SHA-256: e4c02c6474739ee4a761d6a99c232c91fbc9db9baf52d8aa4c79d927d1eb153a
font_01_sfnt_off00010608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10608 11232 bytes
SHA-256: 1fc85c6e3308aff8d72611840f7fa89a56f606d0e89b7c24d9a3f079c78294ff
font_02_sfnt_off00012c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C83 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e