Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f999439dbd25a6c…

MALICIOUS

PDF

85.0 KB Created: 2021-03-25 05:30:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6e6c0df20a7775062f3a9a52ed34c479 SHA-1: 17df56c6d3b609d2e4e96a44644908e08169b3cc SHA-256: 1f999439dbd25a6cb048f3fbe7dde2200dbf88187f276e074d7a4537208d4fc0
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 0.9950

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://lozipotod.ru/123?utm_term=pengertian+bilangan+biner+pdf PDF link annotation
    • http://bafiselavanebep.mywebcommunity.org/what_are_8_limbs_of_yoga.pdfIn PDF document text
    • http://copyright-help-center.com/19199855010xk5le.pdfIn PDF document text
    • http://50off.pro/learning_to_read_malcolm_x_analysis21dow.pdfIn PDF document text
    • http://babusokojanog.sportsontheweb.net/zonipewidozebojok.pdfIn PDF document text
    • http://thedouche.xyz/assassin_s_creed_rebellion_mod_apk_freewcy89.pdfIn PDF document text
    • http://wedipum.mygamesonline.org/animals_worksheet_for_kindergarten.pdfIn PDF document text
    • http://giwitap.getenjoyment.net/79356459849.pdfIn PDF document text
    • http://vitetoka.scienceontheweb.net/antigona_gonzalez_english.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/add_text_to_files_online.pdfIn PDF document text
    • http://rezisekuvaz.mypressonline.com/roland_barthes_camera_lucida.pdfIn PDF document text
    • http://price-list.moscow/how_to_see_live_video_of_earth_from_satellitezwpfg.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/30c9c508-07b3-4bc3-9df0-f2ded2326e89/kiperotupofefifijiju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91543e17-862d-4ec7-a202-cb6a6de1f42e/toefl_vocabulary_book.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/vutafaxunugu.pdfIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_683323552a564fcaad53db74becc60a9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/best_way_to_get_rid_of_wine_belly.pdfIn PDF document text
    • http://kimoviranonaf.onlinewebshop.net/how_to_list_all_drives_in_command_prompt.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/converting_improper_fractions_to_whole_numbers_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a12ea8a-3618-45ea-9e2d-a2e335322665/laserjet_m1212nf_mfp_scanner.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/bagolosetapofid.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/5753588258.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0163ba8-9d2c-4400-9a10-78bf159c3e7c/soxexor.pdfIn PDF document text
    • http://ralirajuz.atwebpages.com/bemeluvovozoxewiposokelow.pdfIn PDF document text
    • http://petojijoxura.onlinewebshop.net/logitech_harmony_880_software.pdfIn PDF document text
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_29b24139e1c2461382066a916d2c581e.pdf?index=trueIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_7a06387e018d412f834a177f5786694b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0ce3508-62ed-4f59-8be3-1ef3633af6c5/logitech_x-530__adapter_bluetooth.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://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_004_off00012906.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12906 18460 bytes
SHA-256: 6c7c253f9286c8550311cd85c7d60d6590dfcb915541e1367c35be06a7610d24
font_00_sfnt_off0000f1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C3 5172 bytes
SHA-256: 2b6e307c5eb72b67b3bf9c3cbc40bc167a828ecd0a6c86f7e9c6cafbeb03960f
font_01_sfnt_off00010365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10365 10868 bytes
SHA-256: 2ac8a0850426fb0303a29f1ec54107027ff43e6d3d8ea17acecf2059e12bffcc