Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa0fb8455f06026…

MALICIOUS

PDF

68.8 KB Created: 2021-03-20 02:04:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcc93556af09c59fcf12824b88e5d1ed SHA-1: 5c666cec51c0d2173a7426665351ba626530931d SHA-256: 7fa0fb8455f060262c4fcf58422d904d06236fef0a337405fb2e8ffa3f2153ca
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for a PDF link farm. The presence of numerous external URIs, many pointing to PDF files, suggests an attempt to direct users to potentially malicious content or phishing sites. The ML classifier and ClamAV detection further support its malicious nature. No scripts were extracted, but the structure and embedded URLs indicate a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/wix?keyword=four+seasons+worksheet+kindergarten
    • https://lokamafurixese.weebly.com/uploads/1/3/4/5/134509290/0b171b22.pdf
    • https://tizelizenofus.weebly.com/uploads/1/3/0/7/130740364/2063037.pdf
    • https://murexaxinafol.weebly.com/uploads/1/3/4/4/134456221/816542.pdf
    • https://cdn.sqhk.co/marixefe/SYyBdik/zutowokifozu.pdf
    • https://cdn.sqhk.co/xumirikebixo/hfjgnic/titonavugekurof.pdf
    • https://muwalivom.weebly.com/uploads/1/3/2/6/132695892/c5ffc7fd9180d95.pdf
    • https://cdn.sqhk.co/zojoguxuban/crWAdr0/50059306867.pdf
    • https://fukorolavo.weebly.com/uploads/1/3/4/6/134639224/zarab_monemuvesozadin.pdf
    • https://cdn.sqhk.co/gupimupiset/hjdn5jj/70304867453.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0660306a-e2ea-4b57-9978-87d32f215699/how_to_turn_on_heat_n_glo_pilot_light.pdf
    • https://s3.amazonaws.com/jezaxojipevu/oxford_listening_test_1_answers.pdf
    • https://s3.amazonaws.com/numunenoji/fizibawowu.pdf
    • http://zuwopun.rf.gd/canon_pixma_mp250_driver_cd_download.pdf
    • http://toraxetutat.epizy.com/63063106853.pdf
    • https://s3.amazonaws.com/wenobagupexekap/ihss_electronic_timesheet_training_video.pdf
    • https://s3.amazonaws.com/padosumifubobo/53313031876.pdf
    • https://s3.amazonaws.com/vipinib/example_of_formal_informal_colloquial_diction.pdf
    • https://s3.amazonaws.com/marimejerebo/how_to_do_settings_on_zoom.pdf
    • https://s3.amazonaws.com/donarepemi/faropixigaxodurufe.pdf
    • https://uploads.strikinglycdn.com/files/fdec96ec-1d21-47d8-9e15-11c5423084e9/59299528853.pdf
    • https://s3.amazonaws.com/tokit/fokebowinifugago.pdf
    • https://uploads.strikinglycdn.com/files/88ce95b2-03f6-44d5-9cad-24ec1cbee300/woodcock_johnson_iv_test_of_achievement_scoring_manual.pdf
    • https://s3.amazonaws.com/kimone/63681051184.pdf
    • https://uploads.strikinglycdn.com/files/bba94533-6c03-4f09-8047-91a7805214e8/ganoferemetobanubebevanar.pdf
    • https://uploads.strikinglycdn.com/files/f088dadd-1932-4897-aa7a-12fdb681d75c/how_to_turn_on_dymo_labelwriter_4xl.pdf
    • https://s3.amazonaws.com/dupula/quartile_journal_citation_reports.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d399.bin
7801f9f1c0f64457a271b1e2dcf2f95dd31a49144af2ea089167c2940e3ebaab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD399 5168 bytes
font_01_sfnt_off0000e539.bin
c318a74192b26661ad69c6116850109b3dfa6c2c5f745952c1962899d40a269c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE539 9544 bytes

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