Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a0d8d7bcd3436ba…

MALICIOUS

PDF

80.0 KB Created: 2021-03-28 15:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d20aab02c46b9634f5fa53fe9fb5c72e SHA-1: 114787f57ef2ba92168955db1a89aba6f5383779 SHA-256: 4a0d8d7bcd3436ba52ada355a2930a29068ed64cf1305a303c3b47b5a840822a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9994

Heuristics 5

  • 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.
  • 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://jottigo.ru/123?utm_term=texas+adjuster+license+exam+answers PDF link annotation
    • https://junoxavod.weebly.com/uploads/1/3/1/3/131384771/jubuxaburaw.pdfIn PDF document text
    • https://romenazojojeles.weebly.com/uploads/1/3/0/7/130775884/koxen_verisotizi_jeduvu.pdfIn PDF document text
    • http://safijejog.mygamesonline.org/best_arduino_starter_kit_2020.pdfIn PDF document text
    • https://kizerovum.weebly.com/uploads/1/3/4/7/134747257/5345754.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/what_is_the_newest_ps_vita.pdfIn PDF document text
    • https://ginabedo.weebly.com/uploads/1/3/4/0/134017532/nibefejamalozo.pdfIn PDF document text
    • http://damodudajipofem.22web.org/87538164890.pdfIn PDF document text
    • https://vidokabotofasi.weebly.com/uploads/1/3/4/8/134868814/seteborufolusipelu.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/fekife/67143582262.pdfIn PDF document text
    • http://ninoxubus.rf.gd/56078117092.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9818ad9-18a7-41e9-b3f2-e4e9bc95e571/sears_garage_door_repair_houston.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/skyrim_se_best_weapon_mods_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/xevofurawuno.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/does_algebra_1_count_as_high_school_credit.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/85260560114.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/7452888522.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/commendation_letter_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9da3e0d-fc90-4f13-a3ee-89436137e430/wofiwodetexilob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da213439-a637-425c-a522-ea9f6df3e4c3/sizijozatisog.pdfIn PDF document text
    • http://retexibew.rf.gd/data_structures_and_algorithms_in_javascript_udemy.pdfIn PDF document text
    • https://s3.amazonaws.com/tafogusegabomu/puvinutagenazonowam.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/91455328180.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2df4050e-f32b-4c60-a7e6-9364e6d89731/how_to_calculate_vapor_density.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_off0000f8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D2 5272 bytes
SHA-256: 57f7cd96ec881e5df86c3092ecb85f44b4d8f024a6203a375941f9a495d36360
font_01_sfnt_off00010ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB8 11220 bytes
SHA-256: 9b0ed913aba0baf71982ba6045aea342163d3cdf96c6e8b27ff0ab132af12b81

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