Malicious PDF — malware analysis report

Static analysis result for SHA-256 7541add82f7a2c76…

MALICIOUS

PDF

80.2 KB Created: 2021-03-10 02:37:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c6739afc3b48c140ae19fa4d5e688858 SHA-1: bf771e7ad95c89b807615e3e47118c8dd27ca954 SHA-256: 7541add82f7a2c76a9aea76d48884520c318f24c967cba32cf592cda4fea7be1
164 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a PDF link farm and a ML classifier indicating maliciousness. The document body, though heavily obfuscated, suggests a lure related to learning phrasal verbs. The presence of numerous external links, including one to 'bologen.ru', indicates a likely attempt to manipulate search engine results or distribute additional malicious content. While no scripts were explicitly extracted, the nature of the link farm and the ML detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/strik?utm_term=good+way+to+learn+phrasal+verbs PDF link annotation
    • http://beststudent.space/6658995199ftrup.pdfIn PDF document text
    • http://revadadijavu.22web.org/valepimun.pdfIn PDF document text
    • http://sq11mini.com/62269147828dgq8e.pdfIn PDF document text
    • http://shtancircul.site/dirigakixazajavadezitb1hk.pdfIn PDF document text
    • https://nobaletakalesig.weebly.com/uploads/1/3/2/3/132302751/8675323.pdfIn PDF document text
    • http://fuvesozufinefi.medianewsonline.com/how_to_recharge_car_battery_with_charger.pdfIn PDF document text
    • http://jilavixit.medianewsonline.com/is_civil_disobedience_effective_in_causing_positive_change.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/28248241357.pdfIn PDF document text
    • http://guzoseta.getenjoyment.net/d_and_d_auto_electric.pdfIn PDF document text
    • https://konozobit.weebly.com/uploads/1/3/4/4/134456152/3473062.pdfIn PDF document text
    • http://itdiscounts.info/vanozadig4sn1.pdfIn PDF document text
    • http://lesifipi.22web.org/bleach_vs_naruto_mugen_apk.pdfIn PDF document text
    • https://jefamozalubibul.weebly.com/uploads/1/3/1/4/131438275/melalidoda-jujojeto-xirisidunexeke-gewere.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/gowebabuxogiro/62605450380.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/japanese_car_auction_sheet_search.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/21964657979.pdfIn PDF document text
    • https://s3.amazonaws.com/nojemi/demelox.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/kunuwalusile.pdfIn PDF document text
    • http://golujaxi.epizy.com/activator_win_7_64_bit.pdfIn PDF document text
    • http://vosolapigufax.epizy.com/34349514471.pdfIn PDF document text
    • http://mojedebebetum.epizy.com/hardball_imdb_parents_guide.pdfIn PDF document text
    • http://jabejanaboz.atwebpages.com/buscador_de_palabras_en_la_biblia_reina_valera_1960.pdfIn PDF document text
    • http://zapuwoz.epizy.com/61622115675.pdfIn PDF document text
    • http://worined.epizy.com/platform_sandals_black_and_white.pdfIn PDF document text
    • http://zufakugofozufi.epizy.com/ancient_greek_coin_crossword_answer.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_off0000fadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADF 5472 bytes
SHA-256: e1f24b758579ec2eb205be3237251d05950e35b8db166678e2787a2fe769bdb8
font_01_sfnt_off00010d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D89 11188 bytes
SHA-256: 14268e5c8b0ba9ec7943b6c4698096c70ce1d6459f93bdbde6b8cda940a82ff4

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