Malicious PDF — malware analysis report

Static analysis result for SHA-256 718cf5560759dca4…

MALICIOUS

PDF

172.4 KB Created: 2021-03-28 07:40:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: d2e2d3039e6c91ef6af316d1f4da131e SHA-1: 9c86ff5884892dc07991f55477c8cea801e22191 SHA-256: 718cf5560759dca4030e6c087bad524f13182c008fc383307561502068a8da97
126 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains text related to "The thousand nights and one night summary" and references the wkhtmltopdf tool, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/strik?utm_term=the+thousand+nights+and+one+night+summary PDF link annotation
    • https://cdn.sqhk.co/fomolunuvufa/sihViev/wolf_bakugou_x_reader_mate.pdfIn PDF document text
    • http://momentshop.website/acrylic_nail_designs_2019_shortupycs.pdfIn PDF document text
    • http://hamlikjorettoop.ru/44629509156dqlet.pdfIn PDF document text
    • http://vvinorama.fun/dosis_de_paracetamol_en_perrosmqqr0.pdfIn PDF document text
    • https://cdn.sqhk.co/nefijisob/iiijjXN/98787644943.pdfIn PDF document text
    • https://cdn.sqhk.co/rinugezig/aHkjijg/drag_racing_club_wars_mod_apk_money.pdfIn PDF document text
    • http://mrshadow.net/robin_hood_disney_whistle_song_chords8zqaf.pdfIn PDF document text
    • https://cdn.sqhk.co/budafitanu/eSXIjht/time_flow_game.pdfIn PDF document text
    • http://24goodstore.site/learn_english_through_story_level_2_subtitlesyjeng.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/jjjhij9/best_ringtone_app_for_iphone_without_itunes.pdfIn PDF document text
    • http://goldenframecollision.com/bobupusowazit7n2s.pdfIn PDF document text
    • http://ductsunlimitedins.com/tutudezuvrwqp.pdfIn PDF document text
    • https://cdn.sqhk.co/gozigawefo/oHwLdhh/13126969784.pdfIn PDF document text
    • https://cdn.sqhk.co/lusimalifa/jgciaje/zuxapukoruwitujododaren.pdfIn PDF document text
    • http://amst-watch-v1.club/vaviboralowonaneziodm0j.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/1cfc2556-702a-4748-9c59-7d4ff07e78a8/tuesdays_with_morrie_literary_criticism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a824d98-c60d-45d6-92bc-a5752e464f7d/how_to_put_chamberlain_garage_door_opener_in_learn_mode.pdfIn PDF document text
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_9230158150ca4958a75766a6a5e0e142.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1648c6a3-14f5-41ec-ae93-4e58c28323f7/where_is_the_repair_shop_show_located.pdfIn PDF document text
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_473f29886aef4cb68059fd62fe852ef0.pdf?index=trueIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off000275de.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x275DE 25112 bytes
SHA-256: b0aa91a58d3a9306402e8ea1f6bab0c3bac841f47e50af3914e38d2dc4591e10
font_00_sfnt_off00023602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23602 5260 bytes
SHA-256: 6fe79b2986b6f325e1078391763a8022b34e9408298c34321fd21897fa7bb383
font_01_sfnt_off000247bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x247BF 15684 bytes
SHA-256: 240b29f6ddea7cd5dcac24af0a1937ab2fc2b660cdef104581f74af214cfda88

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