Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fb81e37b4bc1981…

MALICIOUS

PDF

74.3 KB Created: 2021-02-28 21:34:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 51d23fa0941144aa381552f948ad3da3 SHA-1: 81c0e7acdc869273e7ddc863a3943e8e650f69cd SHA-256: 9fb81e37b4bc19813caf7f49c8a632efbe23290b4aeffca568f88480fc6177a9
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are hosted on disposable domains or link farms, indicating a phishing or malicious redirection attempt. The document body, though heavily obfuscated, suggests a lure related to 'cracking Minecraft servers'. The presence of numerous external links and the ML classifier's high confidence score strongly suggest malicious intent, likely to lead users to malicious websites or download further payloads.

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://bologen.ru/123?utm_term=how+to+crack+minecraft+server PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481275/normal_60271526db080.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423750/normal_60199a57585c0.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/resnick_halliday_krane_solutions_volume_2.pdfIn PDF document text
    • https://gaturavokig.weebly.com/uploads/1/3/4/3/134317265/622831.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492880/normal_5fea39dbc9a41.pdfIn PDF document text
    • https://fozogefijegajor.weebly.com/uploads/1/3/1/4/131453134/7ed0a3a.pdfIn PDF document text
    • http://tibagisuminove.sportsontheweb.net/how_do_you_unfreeze_a_sansa_mp3_player.pdfIn PDF document text
    • http://waystep.site/588415344458d4sf.pdfIn PDF document text
    • http://vipimuxatomefi.medianewsonline.com/fifth_grade_high_frequency_sight_word_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478123/normal_6016d91de1aed.pdfIn PDF document text
    • https://denupadifujufo.weebly.com/uploads/1/3/0/8/130813478/julumuvapiw.pdfIn PDF document text
    • http://presentinsta.online/independent_sales_consultant_agreement_templatem7zzr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495838/normal_602d7bfdcc6a4.pdfIn PDF document text
    • http://pedagodogiko.getenjoyment.net/52078938359.pdfIn PDF document text
    • http://katipef.medianewsonline.com/54361193006.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/marantz_sr6009_4k_hdr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421776/normal_6021a6b44ef6e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B5 5172 bytes
SHA-256: cffca98a5178958bf00da5a396b9920d735f4943e5d0df3d916b5e08e736a86d
font_01_sfnt_off0000f854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF854 10592 bytes
SHA-256: 739159b20d6ee5d485dde2174e283a7292b78071ed1234a26e6deddd0768a147

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