Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5cf83024dd0bac1…

MALICIOUS

PDF

105.7 KB Created: 2021-03-26 09:08:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ec24f5a85dfd7d0015eebaf5dd8d1b1a SHA-1: bf21977037d07d7d3b3ef375fa4281228082003f SHA-256: b5cf83024dd0bac11cb2cc1ec992fd39444cef4f45786a22f326bb63c148c18e
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or malicious redirection attempt. The 'SE_INVOICE_LURE' heuristic further supports this, indicating the document's content is designed to trick the user. ClamAV detection and ML classification confirm the malicious nature of the file. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing attack, likely involving JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://fokemale.ru/123?utm_term=informant+meaning+in+law PDF link annotation
    • https://cdn.sqhk.co/wejafivelij/Xicljkh/five_nights_with_froggy_3.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/ZPjcEhf/stampede_meat_products.pdfIn PDF document text
    • https://cdn.sqhk.co/soleximu/ageJge3/off_road_forest_mod_apk_latest_version.pdfIn PDF document text
    • https://molobaguzali.weebly.com/uploads/1/3/0/7/130739923/4935529.pdfIn PDF document text
    • https://xokefinodoju.weebly.com/uploads/1/3/5/3/135316617/ziberefukuv.pdfIn PDF document text
    • https://cdn.sqhk.co/dodalowogiv/hxUBhaI/88002922896.pdfIn PDF document text
    • https://tuwunujanopir.weebly.com/uploads/1/3/4/6/134617400/4f9576609.pdfIn PDF document text
    • https://dopozigixojak.weebly.com/uploads/1/3/4/5/134509916/345e3c5f.pdfIn PDF document text
    • https://cdn.sqhk.co/puwonereb/YEicaqY/97940559810.pdfIn PDF document text
    • https://detaxenenikub.weebly.com/uploads/1/3/0/7/130776267/4bba6a438.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/inside_out_demi_moore_book.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/xakusineba/50720438230.pdfIn PDF document text
    • http://jagomizaf.atwebpages.com/algorithm_for_all_sorting_techniques.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/aviso_de_privacidad_formato_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/basic_store_keeping_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/octane_and_cetane_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42cbe3a3-1be3-4725-aee3-2c92f2c5030f/66298318478.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f991b65-5142-4394-9955-8edc865070e0/musiwinixugapa.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/94140674575.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/how_to_find_the_volume_of_cones_calculator.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/95649781913.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/dokunegoru.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/1069651545.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/38158471499.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_off0001609e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1609E 4936 bytes
SHA-256: 158fab2522a5ff0e02fe1c9c4921d142e21efed2522a00976266295e5d68392e
font_01_sfnt_off00017165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17165 11824 bytes
SHA-256: 25a00128d271f93399e3640cf4a8348817d2ea56efeab243ac088d20c3ee6184

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