Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5477104c31746ea…

MALICIOUS

PDF

72.9 KB Created: 2021-03-13 21:14:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3462d97eab3609b6e0428267fb3a5e03 SHA-1: 544c180cea0944fe4239bed25ac67fbfcfce5f45 SHA-256: f5477104c31746ea59cfe965df6b3290d8cb45e41d11e66dd457042ab1355e1c
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://zajinet.ru/strik?utm_term=director+of+sales+and+marketing+jobs+near+me PDF link annotation
    • https://zenamuvevabun.weebly.com/uploads/1/3/1/4/131453902/fotalar.pdfIn PDF document text
    • https://cdn.sqhk.co/bidomutarili/qijiihb/wuzijogafego.pdfIn PDF document text
    • http://dobilarujokux.sportsontheweb.net/migevigenapufi.pdfIn PDF document text
    • https://nowatipuzovatob.weebly.com/uploads/1/3/5/3/135397830/lenovuxuxunuxovusi.pdfIn PDF document text
    • https://beluloxepivizor.weebly.com/uploads/1/3/4/1/134131295/40f73ad40df3.pdfIn PDF document text
    • https://nudijezomuxu.weebly.com/uploads/1/3/4/3/134377325/5293271.pdfIn PDF document text
    • https://cdn.sqhk.co/someteku/oTHiiAt/birthday_cakes_pictures_for_adults.pdfIn PDF document text
    • https://pesuwoleze.weebly.com/uploads/1/3/5/2/135295903/a423e74.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/bamepofewalada/55426563194.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/inlet_guide_vanes_hvac.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/bryant_furnace_model_numbers.pdfIn PDF document text
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_2e9854e68e8d44bba918c6b3e5052eef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vebenok/work_experience_letter_template_year_11.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/what_is_the_true_story_of_peaky_blinders.pdfIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_906355beb323461ab8a06aae3b7f1d5f.pdf?index=trueIn PDF document text
    • http://zesafemumibow.myartsonline.com/avery_weigh_tronix_zm303_cant_zero.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/chrono_trigger_guide_ps1.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/tipajowijibiposuz.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/cephas_msipa_book.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_off0000e0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D8 5620 bytes
SHA-256: 603755c8e966f547a48c95d51023f2aad8fdb2ccb73fe7cd1f74482ec0fb08df
font_01_sfnt_off0000f3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3ED 10100 bytes
SHA-256: 140e15801dffa54e212cf79a0c692cd28add98ea1028eda32578c6beacbb61b3

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