Malicious PDF — malware analysis report

Static analysis result for SHA-256 79bf0b91ad0e15c8…

MALICIOUS

PDF

78.7 KB Created: 2021-04-06 11:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fe0d84af1419370b022bab1b2d1eccc7 SHA-1: b220dfba28c6acc2a17a0c20610b272fb8c7d375 SHA-256: 79bf0b91ad0e15c8bcdcccb64ef723aa5385974ba2d9a7d0caccb94cbf85a404
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. 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 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://fokemale.ru/award?keyword=access+control+training+pdf PDF link annotation
    • https://cdn.sqhk.co/fokatekox/jdjjjbq/kiki_s_delivery_service_book_amazon.pdfIn PDF document text
    • http://balifruit.com/sabuweliduvokomeposb5m1.pdfIn PDF document text
    • https://cdn.sqhk.co/wadupaxi/hibhfge/puxavamiwilexugesudogob.pdfIn PDF document text
    • http://vojamugoju.22web.org/bsa_merit_badges.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/j39Ljjg/line_colour_3d_game_download_apk.pdfIn PDF document text
    • http://weareanonymous.org/lazimumabomiw86ung.pdfIn PDF document text
    • http://springwin.space/35011552540yqg1h.pdfIn PDF document text
    • http://all-system7.work/arakawa_under_the_bridge_bd_batch8f03v.pdfIn PDF document text
    • https://cdn.sqhk.co/dobulefipuji/je0RBib/fireman_s_park_pavilion_lindenhurst_ny.pdfIn PDF document text
    • http://tazogupiwelul.iblogger.org/34985321386.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mogonowipekizo.epizy.com/we_can_remember_it_for_you_wholesale_quotes.pdfIn PDF document text
    • http://kewoxorewozox.rf.gd/kejiloxo.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/facebook_apk_for_windows.pdfIn PDF document text
    • http://nedujuji.epizy.com/cessna_152_instrument_panel.pdfIn PDF document text
    • http://tamedigozetot.epizy.com/new_english_file_beginner_workbook_download.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/games_apk_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/infinitive_phrases_exercises_with_answers.pdfIn PDF document text
    • http://judejelalub.rf.gd/free_ldn_muscle_bikini_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/clarks_infant_shoe_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/best_phone_booster_app_for_android.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A3 3088 bytes
SHA-256: a5dfa1cfd2b0e17310fb99632b0a97d9bfc1e8b58bbf32aa010b3f68be88d9a8
font_01_sfnt_off0000f4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A1 5312 bytes
SHA-256: a4dc3f230aad979e4f927d955b20919d78ead44d9df80c237c6741cc45fe583b
font_02_sfnt_off000106c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C6 10864 bytes
SHA-256: 79dc6784e923dd894b7162dc6fe28d475128ba065b75b252c0a0d8677349ff09

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