Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dfc011ab5a3f79c…

MALICIOUS

PDF

70.5 KB Created: 2021-02-13 08:44:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6176f09947235a8dcef88eb7db85235e SHA-1: 1c999fb072a191e3014a5d1213204e55e0647cc0 SHA-256: 0dfc011ab5a3f79c5e9eeb06580b60b54f4e064a364315c1f4c2ad8fddebbd08
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://crophysi.ru/123?utm_term=refugee+ship+drifting+in+space+ftl PDF link annotation
    • http://lunesygets.xyz/89408306789hmf7d.pdfIn PDF document text
    • https://cdn.sqhk.co/fajoliteve/yXUxhib/magic_circle_tapestry.pdfIn PDF document text
    • https://cdn.sqhk.co/xadowififux/etxGheZ/youtool_gta_5_map.pdfIn PDF document text
    • http://setlyb.online/soxatujepibufep4c1qe.pdfIn PDF document text
    • https://buwotudotep.weebly.com/uploads/1/3/1/6/131606539/9446662.pdfIn PDF document text
    • https://cdn.sqhk.co/bibolaned/3id8ege/oscar_de_la_renta_wedding_dress_for_sale.pdfIn PDF document text
    • http://trelon.fun/cuckoo_clock_repair_manual8ul1x.pdfIn PDF document text
    • https://ginugifugebiner.weebly.com/uploads/1/3/4/2/134234672/lutet-dimoropuf.pdfIn PDF document text
    • http://brightshopbg.xyz/letterhead_design_freeswmsf.pdfIn PDF document text
    • https://cdn.sqhk.co/woxemumi/YHVjdjh/planet_defenders_board.pdfIn PDF document text
    • http://digitalmicroteter.xyz/ktm_1290_adventure_2020_prezzofc9vk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tenunud/nothing_bundt_cakes_confetti_bundtlet_nutrition_information.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/lagu_jantung_bergetar_getar.pdfIn PDF document text
    • http://fewuzefar.rf.gd/journal_entries_report_in_quickbooks_online.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_off0000d841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD841 5424 bytes
SHA-256: b36d9bd3d4cc3d6a0a9a90fae351976ddc112758abb8e9f17ca4ed1c388fa5f2
font_01_sfnt_off0000eab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB7 10052 bytes
SHA-256: 35bcbdc185d65b9874fc6ac353471f09ff6a017569698a542f0d1e7d7f18f725

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