Malicious PDF — malware analysis report

Static analysis result for SHA-256 969642132e67a7dd…

MALICIOUS

PDF

92.0 KB Created: 2021-03-28 09:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e788dddfdc941a63f3c22e2f83cccb71 SHA-1: e6862f4edf5a0b5dba8664988628096bade6d3b6 SHA-256: 969642132e67a7dd4d38f84cedb94901594c0030e3c39efe6087fb3b87f8980c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are hosted on suspicious domains and are part of a link farm, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely a phishing lure or a distribution point for further malware. No scripts were extracted, but the presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/123?utm_term=therapist+aid+worksheets+cognitive+distortions
    • https://cdn.sqhk.co/rokijatu/A28jwif/68054976733.pdf
    • http://jinobuzid.scienceontheweb.net/amapola_song.pdf
    • https://ximuvibimujobu.weebly.com/uploads/1/3/2/6/132695583/bisiwotulolokezima.pdf
    • https://cdn.sqhk.co/toviranevu/d5idSfR/colour_block_denim_jacket_blue.pdf
    • https://kiriwalukejogof.weebly.com/uploads/1/3/4/3/134310578/siturogek.pdf
    • https://kelunegitafisi.weebly.com/uploads/1/3/4/6/134625524/6e5387.pdf
    • https://cdn.sqhk.co/kevovevude/ebgdmGt/social_media_marketing_courses_online_udemy.pdf
    • https://cdn.sqhk.co/lisupixiwe/SjgtnWO/fall_guy_gmc_truck_for_sale.pdf
    • http://malanefire.sportsontheweb.net/boost_converter_project_report.pdf
    • https://cdn.sqhk.co/fetebutujo/hjX3A3x/96964754347.pdf
    • https://cdn.sqhk.co/negapevu/Bheifii/siren_head_horror_escape_scp.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2ecc5813-8c8b-45a0-8782-5b2b7dd3a580/sony_rx100_vii_manual_focus.pdf
    • https://uploads.strikinglycdn.com/files/fadf1f2e-29c9-4552-813a-7534668c852d/data_science_handbook_usyd.pdf
    • https://uploads.strikinglycdn.com/files/0097d4a4-fc30-4d55-b815-8d2348e1c347/like_water_for_chocolate_book_spanish.pdf
    • https://uploads.strikinglycdn.com/files/603bc97b-26d2-40b4-b33f-9eb34fda47ff/zogemivosaxowove.pdf
    • https://uploads.strikinglycdn.com/files/a986c7da-76c5-4932-9087-e8e64a341fad/51259797178.pdf
    • https://uploads.strikinglycdn.com/files/e2d9e04a-fa4d-401d-ab03-551332c3aff9/what_are_the_project_topics_in_mathematics.pdf
    • https://uploads.strikinglycdn.com/files/b98183af-3961-403c-ae83-56316ae33044/7548821249.pdf
    • https://uploads.strikinglycdn.com/files/304da20d-3ad9-4be2-bb6e-1e094398bd86/how_do_i_stop_my_adt_alarm_from_beeping_when_i_open_the_door.pdf
    • https://uploads.strikinglycdn.com/files/70e853a7-0368-4265-ae97-b17f76eebf16/mipudiwizapenogu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001292e.bin
5d2ddaa62cd23b177744ae03cb51ebd4395a3c7e9a1cd0416a231c31c30a6822		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1292E 5468 bytes
font_01_sfnt_off00013bdc.bin
d395afb6133467c7792748c920225f2e477489150b00f03f86693c7fc3ff20ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDC 10944 bytes

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