Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f66781fca48c29d…

MALICIOUS

PDF

75.8 KB Created: 2021-02-28 03:36:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 63824f6cdb50dbb715020d72eabca9c1 SHA-1: 7e9bbe032999fc5a93d1bd134e0a35bcca042f61 SHA-256: 4f66781fca48c29df62aa95b2313c445742b853e51b31c0b10747e6bab70d146
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to a 'common-knowledge test', aligning with a lure for user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=what+is+a+common-knowledge+test PDF link annotation
    • http://vkrowl.com/kowipumejiviripivowoko96qrc.pdfIn PDF document text
    • http://rubisteq.online/formal_business_apology_letter_formatuvve5.pdfIn PDF document text
    • http://kudretbozaci.com/18969415607ugndm.pdfIn PDF document text
    • http://gowanenutik.mypressonline.com/2746700204.pdfIn PDF document text
    • http://batizilojado.22web.org/calligraphy_workbook_free.pdfIn PDF document text
    • https://gojanaribebiw.weebly.com/uploads/1/3/1/4/131437307/xopobosuxawel-latazazuxalodon-jalukar.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/how_to_say_yah_in_hebrew_audio.pdfIn PDF document text
    • http://mokaxizekebade.scienceontheweb.net/the_red_tent_book_summary.pdfIn PDF document text
    • https://webegoxu.weebly.com/uploads/1/3/2/6/132682681/vaverebipiwavit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://napalujimawoz.rf.gd/fedema.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/vans_old_skool_plataforma_preto.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/cooking_level_guide_bdo.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/reading_ancient_chinese_chariots_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/juvenile_crime_news_report.pdfIn PDF document text
    • http://solatilexi.epizy.com/86701179491.pdfIn PDF document text
    • http://tipewonapifaguf.epizy.com/fobonebudejalekaginoke.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/77936021132.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_off0000e9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C3 5456 bytes
SHA-256: a7783e67c8347232fbcc987fb56ecd42c9dc06d709990403af29c789c30bb84b
font_01_sfnt_off0000fc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4F 11008 bytes
SHA-256: 3b76e7564b858d0f51267b7cb8ab87c20b1120a81c77b7d287784fc3012e24aa

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