Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be0672fe958558a…

MALICIOUS

PDF

65.9 KB Created: 2021-01-18 20:42:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8c5770643c25d384e4d6aa38160a8990 SHA-1: 1cfc200540d5d494bcf6a0920a101ac8cbb1f32a SHA-256: 7be0672fe958558a6728a9bd86088b8e9a1c737ea1a7da8c2e12ecf13c8c70d4
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, with several pointing to disposable domains and link farms, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were explicitly extracted, the presence of embedded URLs and the PDF structure itself are indicative of malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/123?utm_term=functional+decomposition+diagram+%2528fdd%2529 PDF link annotation
    • https://cdn.sqhk.co/jowapezo/6hgUPgf/99833660151.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490133/normal_5fad91ed8b1eb.pdfIn PDF document text
    • https://site-1168252.mozfiles.com/files/1168252/age_of_z_origins_infinite_zombies.pdfIn PDF document text
    • http://jetolad.iblogger.org/41586030535.pdfIn PDF document text
    • http://xogezile.66ghz.com/7th_grade_english_grammar_test_with_answers.pdfIn PDF document text
    • http://kulokozataxat.22web.org/42928650288.pdfIn PDF document text
    • http://ropufogesuzazeg.iblogger.org/resident_evil_5_movie_in_telugu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472475/normal_5fe6d9bfd7c6b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://refaruzevogot.epizy.com/pitu_app_chinese_apk.pdfIn PDF document text
    • http://xevorerokune.epizy.com/56343865425.pdfIn PDF document text
    • http://mavipob.epizy.com/steam_api64_dll_missing_gta_5.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_off0000c65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC65B 5584 bytes
SHA-256: dc74234bf72ba030b0e1a9019ab18c12fa37478a389ca8c43d22c3a4c56c99c7
font_01_sfnt_off0000d951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD951 9880 bytes
SHA-256: ae62e8aaaf7f4ec607767f16c52f8d1cd94a242730c9020a0eb46474d7d4c8bd

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