Malicious PDF — malware analysis report

Static analysis result for SHA-256 79248ed4bb064be6…

MALICIOUS

PDF

85.0 KB Created: 2021-03-05 00:15:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d9d7a8109a7541acd36e98a32ab88a32 SHA-1: c54ff77943a73d590c90c20c2fa2edcbae40c816 SHA-256: 79248ed4bb064be6206236046d89b28f66502b05944099ff5c867d50a72ccdf6
194 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious payloads or redirect users to phishing sites. The document body, though heavily obfuscated, appears to be a lure related to 'English grammar practice PDF download'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gimoguvi.ru/123?utm_term=english+grammar+practice+pdf+download PDF link annotation
    • http://xivasupati.iblogger.org/ruzezojurazilawa.pdfIn PDF document text
    • http://pinopizo.sportsontheweb.net/how_to_erase_iphone_4s_without_apple_id.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478950/normal_5fec7b47771ab.pdfIn PDF document text
    • http://1xbet-registrat.site/libro_metodologia_de_la_investigacion_sampieri_ultima_edicion61lcr.pdfIn PDF document text
    • http://dream-stat.ru/gifuvugyf3c0.pdfIn PDF document text
    • https://ripaduwik.weebly.com/uploads/1/3/5/3/135311581/vomus-ganira-zelopotu.pdfIn PDF document text
    • https://venevivoxeda.weebly.com/uploads/1/3/1/8/131857756/lavatag.pdfIn PDF document text
    • https://duzozutilitu.weebly.com/uploads/1/3/0/9/130968921/bazuwalajivak-tejuzipumetu-zufupet-duvedegizewar.pdfIn PDF document text
    • http://kagijaxubosigu.22web.org/how_to_remove_kenmore_dryer_pedestal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483349/normal_6014ba9002e52.pdfIn PDF document text
    • http://balegetiwep.mywebcommunity.org/twilight_saga_books_used.pdfIn PDF document text
    • http://topstop.site/cloud_printable_templatexymos.pdfIn PDF document text
    • https://fepaxawasebunud.weebly.com/uploads/1/3/5/3/135327574/furupirefis-wobareluvi.pdfIn PDF document text
    • https://junerokiwoji.weebly.com/uploads/1/3/0/7/130775834/fcf2e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_9e7b8ff65c2949d4a89d482462a377a6.pdf?index=trueIn PDF document text
    • http://lilivuxaja.rf.gd/igcse_economics_revision_worksheets.pdfIn PDF document text
    • http://dimegebewode.epizy.com/coreldraw_x7_2019_kuyhaa.pdfIn PDF document text
    • https://203aa715-7352-46b1-b16b-5d0aeeaa27a2.filesusr.com/ugd/0582e0_64ce9949a7e84b32b14c5cdae4c00503.pdf?index=trueIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_bced6efc02e245ae9366cebf04e80990.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA4 5408 bytes
SHA-256: 543998e8633511e018df206b5d8f8acff1ffaebc9f6eb1620e09ad903cb7d1a6
font_01_sfnt_off0000f0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E6 10456 bytes
SHA-256: 61b22d60263b9f1e76b8a10333737da32b78fd8f5a59ccd7bb238a01f3b9daf3
font_02_sfnt_off0001149e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149E 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
font_03_sfnt_off0001229f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229F 11428 bytes
SHA-256: d2a4d532ba56f86f6e816c0db2f18b3c6adf650459a7c69b18315f92cbcaaa44

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