Malicious PDF — malware analysis report

Static analysis result for SHA-256 63f3a75a6ffce9d3…

MALICIOUS

PDF

77.1 KB Created: 2021-03-11 03:09:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 06fc1adc278b3cb624c200a2b58b7710 SHA-1: b6578a0844cc6841d04190e4503ba81f00d8bd97 SHA-256: 63f3a75a6ffce9d3f0a34b7e73edc12ed866480c8a27f106503a2ebc2f9c0aeb
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are on disposable hosting and use UTM parameters, indicating a link farm or SEO spam campaign. The primary URL, 'https://leonvi.ru/strik?utm_term=dell+optiplex+9010+price+in+qatar', suggests a lure to search for specific product prices, likely to redirect users to malicious sites or advertisements. ClamAV detection and ML classification confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=dell+optiplex+9010+price+in+qatar PDF link annotation
    • https://cdn.sqhk.co/nokotadi/gdnhbie/98417385380.pdfIn PDF document text
    • https://cdn.sqhk.co/kajurineg/bhbhiYw/jukotuteritefosetelod.pdfIn PDF document text
    • https://cdn.sqhk.co/zowajomi/iibqkii/qr_code_scanner_download_online.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/ic2giif/wazudedebefusimofuxav.pdfIn PDF document text
    • https://cdn.sqhk.co/zadorari/gjiXcib/download_game_naroth_mod_apk_offline_2015.pdfIn PDF document text
    • http://gijutudubesakuz.iblogger.org/oecd_report_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/sumavevop/ihajejh/arcade_machine_walmart.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/vinivuxo/activetcl_8._6_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/pilesadugufulubugefo.pdfIn PDF document text
    • http://bokonukavebuso.rf.gd/harley_davidson_tech_bulletins.pdfIn PDF document text
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_06e3b19568a24f86a89a7e4e42dbeffe.pdf?index=trueIn PDF document text
    • http://falepafi.epizy.com/breville_bes870xl.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/flume_apache_user_guide.pdfIn PDF document text
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_f3b588453f324e6cb833edf71afa620a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/65064414903.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/mufitu.pdfIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_7a31cf7a78a944fc81a136a884414a68.pdf?index=trueIn PDF document text
    • https://7b4e975e-109f-4397-a679-93e438ff1453.filesusr.com/ugd/c33f71_ddcc56ebb28e467686ced80dbb8ed829.pdf?index=trueIn PDF document text
    • http://putazosaw.epizy.com/material_design_guidelines_search.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/vajos.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_off0000ecd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD0 5292 bytes
SHA-256: f1626deba5d7173b522d13a2429d5a190ef9921602570f6e03d34ccc493839c1
font_01_sfnt_off0000fef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF7 11420 bytes
SHA-256: 67cebcea422d008c844c987fcd98ab079950f0d8674a7e91d468db1469f782ef

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