Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b06b648e1f17f2b…

MALICIOUS

PDF

77.7 KB Created: 2021-03-15 21:34:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 1c4f203c8c014d4669319e554a3e8393 SHA-1: cc7cce675f65975bc5e5bc3bc64a9fa162abab59 SHA-256: 8b06b648e1f17f2b0bb1ac7f5afe713e5585dca908855e6ad1978d9ef0d17feb
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or redirection scheme. The embedded URLs likely lead to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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://jacksth.ru/award?keyword=blueprint+4+student+book+pdf PDF link annotation
    • http://submonster.xyz/50_pips_a_day_forex_trading_strategyh96yv.pdfIn PDF document text
    • https://joguxakiwemov.weebly.com/uploads/1/3/4/7/134707067/pidoxetijanene_lasujabiw.pdfIn PDF document text
    • http://reduslim-ufficiale.website/duponudel6o6hx.pdfIn PDF document text
    • https://virerulifig.weebly.com/uploads/1/3/1/4/131407283/4132174.pdfIn PDF document text
    • http://repaircreditscore.info/35432682015v0fvu.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvaworizon/njajijg/rabivolew.pdfIn PDF document text
    • https://nizomepovunamox.weebly.com/uploads/1/3/4/3/134305669/pudidij-kapowerisonujoz-vofodoruregodak-foriwaxame.pdfIn PDF document text
    • https://cdn.sqhk.co/definuseju/jcJigjf/76736665060.pdfIn PDF document text
    • https://cdn.sqhk.co/bulegumu/Pojaj5c/damikipofofer.pdfIn PDF document text
    • https://cdn.sqhk.co/naxopesareg/jhWtTAW/antivirus_virus_cleaner_applock_clean_boost.pdfIn PDF document text
    • http://sodalabs.club/guboxelefatunuda6khs1.pdfIn PDF document text
    • https://fotewusobowo.weebly.com/uploads/1/3/5/3/135339642/fakav.pdfIn PDF document text
    • https://nofodomeki.weebly.com/uploads/1/3/1/8/131871852/puzezivowofipedu.pdfIn PDF document text
    • http://faceskinagainbeauty.xyz/android_auto_mirrorlink_hacks0erp.pdfIn PDF document text
    • https://wopadutizibum.weebly.com/uploads/1/3/4/3/134306931/6802309.pdfIn PDF document text
    • https://cdn.sqhk.co/sipobufiw/icTUies/23482597612.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://33fe1336-4051-433c-b691-b763732126dd.filesusr.com/ugd/6c8f37_89e7711f5a2145d98ad3e9a7b8cfd0af.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d936cb38-cca9-4838-ac95-d02d7305067b/blink_book_in_hindi.pdfIn PDF document text
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_8e005870a04f4ad39b63a6f9c68f5d18.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/38f5da78-d1f9-45d2-9e16-de61251493e1/pusozinamewasawepipi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a4a2f76-f196-4ceb-b336-ab8815b08760/nofebofunuzasotojoxu.pdfIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_522f77b734654e8898887bac4c104787.pdf?index=trueIn PDF document text
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_3f065af8247e48fe9cfa7e64c8aa500e.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD020 10456 bytes
SHA-256: fe07faf6a525a0feba2239a7a7d48b4aa3564a759d2537e3a3ce0fd42e31df62
font_01_sfnt_off0000f312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF312 5164 bytes
SHA-256: a47edad93de87ac16730973d6f7dd8a02cd8c706188bbf117f0869d08b106b5e
font_02_sfnt_off000104b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B6 10616 bytes
SHA-256: 85350522d9484c8beacfa994f4b314ec1bcabba6fa8c5905a5c5a36623e8c752