Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae6313b84b48fb16…

MALICIOUS

PDF

102.9 KB Created: 2021-03-05 10:44:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 50cce98d673305a8519fa0b690ad51e4 SHA-1: 268649b7ba56e9db7bfdf7d956c8947c6a8d6087 SHA-256: ae6313b84b48fb16b6891f4063524ccf1afa6c0b5f687aba5af86c29a904081b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' suggesting a large number of outbound links. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the presence of embedded URLs and the PDF structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/123?utm_term=david+attenborough+life+story PDF link annotation
    • https://cdn.sqhk.co/pajelidul/jfijRgh/4523890387.pdfIn PDF document text
    • https://cdn.sqhk.co/zizenozi/bKgibge/mystic_vale_ios_review.pdfIn PDF document text
    • https://cdn.sqhk.co/remezebona/gjiiaKL/82530292256.pdfIn PDF document text
    • http://ketijuke.22web.org/73106227413.pdfIn PDF document text
    • http://dijemakipesozox.iblogger.org/tezuroguwefuxe.pdfIn PDF document text
    • http://zizowifajazabor.22web.org/what_do_brown_bear_mean.pdfIn PDF document text
    • https://cdn.sqhk.co/kewebogi/9ZCijlW/minerals_function_in_food.pdfIn PDF document text
    • https://cdn.sqhk.co/develezuwa/bid15ic/12499591661.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/vigevot/16442599650.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/halo_bassinest_swivel_sleeper_mattress_pad_waterproof_polyester_white.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/29824252977.pdfIn PDF document text
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_96eb594714934c14a3443b4fd37e1cff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/script_gallery_google_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/guwizogozosopidigipexeju.pdfIn PDF document text
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_e7f155907d4b4b62868deea514c1a8b1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/2010_chevy_impala_lt_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/abcd_2019_movie_songs_naa.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/stone_age_food_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/rififasawufogu.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/financial_report_of_a_company_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/hanuman_video_songs_in_telugu.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_off00015575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15575 5468 bytes
SHA-256: e7737170096a6183ba774275f20e6b8aa27570f142560ac078fe258460b80092
font_01_sfnt_off0001681c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1681C 10944 bytes
SHA-256: dc2d23a614682a6563a979bac7ac329b883e543536c39915faf42c5945dbe30b

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