Malicious PDF — malware analysis report

Static analysis result for SHA-256 4428265cd9cbfcd7…

MALICIOUS

PDF

79.5 KB Created: 2021-04-01 07:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a6fa9bdb38d3d49cb518fc4fce53f21c SHA-1: 752178c7ccabf8fbd807732607afedfda4f2b21c SHA-256: 4428265cd9cbfcd7ede9d1f0c68e965cebdb77290bcc7dbe94e31ab80ba21caf
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://jottigo.ru/123?utm_term=escape+room+level+91-+100+answer+key PDF link annotation
    • https://cdn.sqhk.co/miraroki/Vf6zihZ/thumbelina_song_lyrics_youtube.pdfIn PDF document text
    • http://trydouche.xyz/what_is_the_prefix_in_the_medical_term_microbiologistyr5nc.pdfIn PDF document text
    • https://guvolobojifo.weebly.com/uploads/1/3/4/7/134733869/9574382.pdfIn PDF document text
    • http://kupiokno.su/conflict_resolution_steps_in_marriagevskpm.pdfIn PDF document text
    • http://pukebebizadolu.mypressonline.com/16162029815.pdfIn PDF document text
    • https://wagofokixe.weebly.com/uploads/1/3/4/6/134694124/mometawojizulu-sixililo.pdfIn PDF document text
    • http://hurleyshamburgers.com/where_to_get_tracfone_data_cards0ie4h.pdfIn PDF document text
    • https://zesudegefomoga.weebly.com/uploads/1/3/1/0/131070027/266ab68.pdfIn PDF document text
    • http://riniwodifole.medianewsonline.com/rosslare_access_control_manual.pdfIn PDF document text
    • https://lexijodipegi.weebly.com/uploads/1/3/4/5/134510521/52173ae635d.pdfIn PDF document text
    • https://cdn.sqhk.co/kipezipilojo/iGFjfii/how_to_make_a_3d_origami_swan_instructions.pdfIn PDF document text
    • http://jepewadagamer.scienceontheweb.net/24383429810.pdfIn PDF document text
    • https://finedogu.weebly.com/uploads/1/3/4/7/134749629/jivorejamamidupibik.pdfIn PDF document text
    • https://cdn.sqhk.co/wifuponi/ajdghEd/how_to_add_filters_instagram_story.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nevafofuvabovid.atwebpages.com/repowuxokavugapopopopenum.pdfIn PDF document text
    • http://gakilasefit.myartsonline.com/82798128220.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4289aeef-3f2f-4434-bba1-4e24d3e420f2/what_is_the_best_time_to_pray_salatul_istikhara.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cd0f39d-7e4c-4700-a121-7ed7d3feded3/review_of_distance_formula_midpoint_and_slope_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/756d1875-68e6-42e2-8147-e93c8fe3ff46/sipuvowaxaf.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_off0000d90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90E 5736 bytes
SHA-256: ad51d914848497f87ef12dbdc75e5ab3329dc3fa5a0e90ce03a904def2352ef1
font_01_sfnt_off0000ecad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAD 10304 bytes
SHA-256: 9f420f0a3391c8bd218f2a1585133651e10bd2c3aab63d10b4c655dce5c770fd
font_02_sfnt_off00011032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11032 19548 bytes
SHA-256: eb0974d2f72fc60678f84feb0620c37a4ea178cb1657ff84a4966541a776d4bd

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