Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfddac286c84609b…

MALICIOUS

PDF

67.5 KB Created: 2021-05-05 18:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 002083109ca381ea38dacdde4e47eeda SHA-1: 89adc1d2f68396dfed54c4058b1a4477b681b622 SHA-256: cfddac286c84609b91c428107af942bedaac90e365abb36b688e716840265071
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting an attempt to obscure the final malicious destination. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cdn.sqhk.co/lunabati/QifEYhh/xfinity_stream_beta_channel_for_roku.pdf
    • http://ketrovk.xyz/ziwetigokurewesb6mri.pdf
    • http://vavexefane.mypressonline.com/business_english_course_for_beginners.pdf
    • https://cdn.sqhk.co/zijigemeworu/hhb3geM/stick_fight_2.pdf
    • https://cdn.sqhk.co/sabimejuka/ij6PNPq/fr_legends_car_codes.pdf
    • https://cdn.sqhk.co/bexoninodag/UFxijgf/6901_tower_road_denver_colorado_80249.pdf
    • http://zugezufamuluki.iblogger.org/pegesorezadisevupap.pdf
    • http://matroskin.space/kung_fu_panda_2008_po_vs_tai_lungxqv6b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/G1IkLG9TFNM/wb?keyword=dr%20nelson%20pediatrics
    • http://rozasazi.epizy.com/wevuxuwuxokageleg.pdf
    • http://bezepegu.epizy.com/mulukudekon.pdf
    • https://uploads.strikinglycdn.com/files/7b3fbb9b-dba4-4549-b6c3-783d4b7c2ff9/wejix.pdf
    • https://uploads.strikinglycdn.com/files/a03fc0e3-8463-4a59-8ba4-fe1e8d4a4011/realspace_magellan_hutch_assembly_instructions.pdf
    • http://xafinoligu.epizy.com/kizabewiwitubatizizef.pdf
    • http://medinivixajobo.rf.gd/how_to_say_japanese_in_chinese.pdf
    • http://bitenozof.atwebpages.com/taylormade_r15_adjustment_tool.pdf
    • https://uploads.strikinglycdn.com/files/97d16ac5-9835-4ec4-9aaf-641618a3fa00/58008926569.pdf
    • http://luregaw.onlinewebshop.net/40544400382.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb25.bin
3bc05cd9a331b128b4c877c8da0128f4761bd561323d3e252cafb1c44c7b4e70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB25 5064 bytes
font_01_sfnt_off0000dc70.bin
05407c913979d38e51422b9dd9c3fb8d33aba40929545665b1451c1ad2e974b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC70 10652 bytes

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