Malicious PDF — malware analysis report

Static analysis result for SHA-256 0381a3a5793b1c57…

MALICIOUS

PDF

104.8 KB Created: 2021-03-24 23:54:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 21975437991bedc12549f16a81a0ba2a SHA-1: 10773036abf99268556ff8aae454777de6b32d83 SHA-256: 0381a3a5793b1c576d273435b7e995f4d1190d8ed62b075a64f968db8a6f696f
126 Risk Score

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 0.9993

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 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://kuzutuzo.ru/strik?utm_term=navy+fitrep+writing+instruction PDF link annotation
    • https://cdn.sqhk.co/tovipovo/Kg1V0jh/4783283066.pdfIn PDF document text
    • http://jobauthor.online/mhw_autumn_harvestby3g5.pdfIn PDF document text
    • http://birebap.scienceontheweb.net/11952466688.pdfIn PDF document text
    • http://lozomaneje.getenjoyment.net/pijamewetekerotuj.pdfIn PDF document text
    • http://qqkaxes.xyz/fadumowetajafukojax9chzk.pdfIn PDF document text
    • http://mekomob.getenjoyment.net/90603468767.pdfIn PDF document text
    • https://cdn.sqhk.co/gavezexu/dmhKwia/traffic_rider_apk_ios.pdfIn PDF document text
    • http://tesekal.mygamesonline.org/how_much_is_big_tom_worth.pdfIn PDF document text
    • http://luminar3-download.xyz/zuvenomoton3wo8r.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/CsqibHb/duzibadufefubonatamarukez.pdfIn PDF document text
    • http://fofiwafajelerax.sportsontheweb.net/73378460297.pdfIn PDF document text
    • http://jiwapadenejeza.getenjoyment.net/animator_s_survival_kit_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/1168d979-6ef7-4b9a-bd11-95afa7ade67d/long_john_silver_coupons_december_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3a40fa1-5c77-43ac-aa64-c213941581bb/computer_networking_a_top-down_approach_featuring_the_internet_8th_edition.pdfIn PDF document text
    • http://nufulavidibime.myartsonline.com/englisch_bungen_klasse_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4535153c-8e1a-48fa-864b-b698e779b01e/crossfit_strength_training_at_home.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3f29868-a6f7-4048-bd78-90feb885bfea/41956881161.pdfIn PDF document text
    • http://pawuzax.onlinewebshop.net/51641223721.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05ee19c5-7b9d-4066-8ace-89809f54d6a5/starting_strength_program_review.pdfIn PDF document text
    • http://rorazizaxaf.atwebpages.com/romance_of_the_three_kingdoms_13_switch_review.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1B 5256 bytes
SHA-256: c86a3d45a105082e661f320d9f9427d8249daeb448e705f30d9cde845b7469f8
font_01_sfnt_off00014024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14024 1748 bytes
SHA-256: 247269741f98d8db673b7b95a671bfa625036eb812ba676eab0b225b14936c0f
font_02_sfnt_off00014894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14894 12352 bytes
SHA-256: 6d0694913b109649a3099019ab1aedba3a21553a4d7f2457e7d0fa2304cde6db
font_03_sfnt_off00017219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17219 16080 bytes
SHA-256: 4862f0796d5cbf2b429715f2b47f15d06f0c641f927a022d27f217f4f39910ad
font_04_sfnt_off000186d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186D0 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361