Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92f347831085aca…

MALICIOUS

PDF

106.4 KB Created: 2021-05-16 23:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 83ad714b46740581179582e284cbbaa8 SHA-1: df44e36ee5d1e9765b3010c572a381b8148b1954 SHA-256: f92f347831085aca5657c87fb038a3b2fcb70cf6a239e32d756271566007d5cd
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 0.9997

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://midufefew.ru/strik?utm_term=composites+in+aerospace+structures PDF link annotation
    • https://cdn.sqhk.co/rutunidosaw/eaihjbz/open_houses_today_nutley_nj.pdfIn PDF document text
    • https://cdn.sqhk.co/nadizolobe/Y6y3qhf/beats_x_problems_charging.pdfIn PDF document text
    • https://cdn.sqhk.co/wimedizi/ftlrgiF/vasijenomejiv.pdfIn PDF document text
    • https://cdn.sqhk.co/leluforeref/gUsAHhd/landscape_in_the_mist_music_download.pdfIn PDF document text
    • https://redobalopubijav.weebly.com/uploads/1/3/1/3/131380120/199913.pdfIn PDF document text
    • https://cdn.sqhk.co/dujujema/aheFXji/vutikebawokesilomalafape.pdfIn PDF document text
    • https://karubidodofibe.weebly.com/uploads/1/3/4/3/134316277/162549.pdfIn PDF document text
    • https://cdn.sqhk.co/nezotelo/GhjeNTA/unicorn_pet_costume_kmart.pdfIn PDF document text
    • https://polupamenutotuk.weebly.com/uploads/1/3/5/3/135334754/jafuxixezimaniba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfb1f916-9683-425d-9b45-d25dcbf95820/jagofokejosinujofilibomid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a23f73e0-9865-40fe-9507-f35ecca096bc/34050148361.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/93150356448.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/10167888485.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83a821ce-adec-46bb-94a3-4dcfdcb3a5ac/xiwoganaseziwamupibo.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/31534696596.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a06d61d-0e30-4492-88d2-2ac6c201bcb9/66530880279.pdfIn PDF document text
    • https://s3.amazonaws.com/dikomavomem/capsule_endoscopy_report_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e482169f-d73c-4b3a-8880-950c42dd665e/sogavugoditonule.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/bhagavad_gita_telugu_lo_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/21184231836.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/vepudidegadugobaf.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DF7 4952 bytes
SHA-256: 716092fbe48e385cb003ed385283b55a8a0e7c34edb20b387cf6fd9453e2b141
font_01_sfnt_off00015eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EAF 11740 bytes
SHA-256: 68e2767599806c630b1c5f6924cd6f9319198af7843b80d75a405430aef47b2f
font_02_sfnt_off0001850b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1850B 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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