Malicious PDF — malware analysis report

Static analysis result for SHA-256 74bfed5b5fae1df5…

MALICIOUS

PDF

77.9 KB Created: 2021-03-29 05:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b071ec39cf93d1a976baa0131600554f SHA-1: d8f856ce1dd4393dbff291d84841b63968e6a499 SHA-256: 74bfed5b5fae1df53a160082ade2dd3c70d5fc4c5afdbb21580c996111b597a1
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one pointing to 'zajinet.ru', suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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
  • 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://zajinet.ru/123?utm_term=snickers+bar+nutritional+information PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4425227/normal_5feb52e79941f.pdfIn PDF document text
    • http://trenketo.buzz/somunupetejaisua6.pdfIn PDF document text
    • http://rusewigojubilon.mygamesonline.org/bozuxuxazuvixivanefifa.pdfIn PDF document text
    • http://wogizejelalod.iblogger.org/balantidiasis_tratamiento.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417658/normal_60319cf4d6cb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367622/normal_602295faae2a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371267/normal_5fee6b0b55dee.pdfIn PDF document text
    • http://mivifukatovaga.getenjoyment.net/xofexagob.pdfIn PDF document text
    • http://shopmzm.site/air_pollution_notes_vtu2u1pu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447267/normal_6008cf5a61601.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/40b6e1d7-af70-4db7-a9eb-a417be3e8a34/what_is_the_biblical_meaning_of_intercession.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9159f94-1c49-42e5-b1a8-0d65e3b82868/8340436127.pdfIn PDF document text
    • http://wilaroxu.atwebpages.com/74873270165.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20e243be-f83d-485f-b01b-298cc769f0e8/26627913101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5006381a-023a-4f02-96ab-e5adc11c338f/sony_dream_machine_icf-c414_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d03c6876-a0c9-4a9a-ba4f-0349bacf982e/vishnu_sahasranamam_telugu_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c33b683-228b-4820-a410-b55545e01388/hp_printer_5610_ink_cartridges.pdfIn PDF document text
    • http://depimakari.epizy.com/2198433911.pdfIn PDF document text
    • http://gusepegap.rf.gd/cambridge_advanced_learner_s_dictionary_download.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_off0000f19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19E 5332 bytes
SHA-256: 90e3508033bcafaad2280c7dd1b4a35d485d6f4d2a7fed2e4fc6e19052a578c6
font_01_sfnt_off000103b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B4 11216 bytes
SHA-256: 46083c9ee25cb58363013a19e673d9e2dd7869aaeacc77855973035b67dd000f

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