Malicious PDF — malware analysis report

Static analysis result for SHA-256 79af5bf451e5c441…

MALICIOUS

PDF

104.1 KB Created: 2021-05-13 08:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bf035c8d507e19287d157ea5a5026e18 SHA-1: 4a6c58dd4136c6fa3098cef0f0962e9c1f092023 SHA-256: 79af5bf451e5c4416291dbf2ed1363ed164b2834e81378e4fe29751d9b3ebc80
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many pointing to disposable domains and acting as a link farm, a common tactic for phishing or distributing further malware. The document body, though heavily obfuscated, contains references to communication and marriage, potentially a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://nipisod.ru/strik?utm_term=how+to+communicate+to+save+your+marriage+strong PDF link annotation
    • http://giwitap.getenjoyment.net/10233336811.pdfIn PDF document text
    • http://degimogug.mypressonline.com/college_basketball_court_dimensions.pdfIn PDF document text
    • https://cdn.sqhk.co/pekotegafod/iayqn0Z/44166816215.pdfIn PDF document text
    • http://leopolds.space/cost_of_sub_zero_pro_48_refrigeratorka4pu.pdfIn PDF document text
    • http://roselosudeve.sportsontheweb.net/tukudeperavivizuvurataj.pdfIn PDF document text
    • http://kushtanash.ru/epson_artisan_1430_service_manualhygf1.pdfIn PDF document text
    • http://ru-dev.xyz/block_international_calls_at_temqwh.pdfIn PDF document text
    • http://submonster.xyz/is_jupiters_storm_getting_smallertc5qg.pdfIn PDF document text
    • https://cdn.sqhk.co/titesojijuko/j29bjiA/7362848477.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/jgX4gcq/micro_pigs_for_sale_scotland.pdfIn PDF document text
    • http://groby-ritual.online/nibevalafoxokotesasu6frp7.pdfIn PDF document text
    • https://cdn.sqhk.co/rajemaramiw/ibKbitZ/42174592915.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kipazafar.atwebpages.com/how_to_use_lg_tracfone.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/lekezowufavidixeluwagij.pdfIn PDF document text
    • http://xovefopu.myartsonline.com/verbal_analogies_list.pdfIn PDF document text
    • https://147762ec-90f0-4523-8579-43cb3cd17c82.filesusr.com/ugd/6c48b9_dfaca8e00bdf4aad9e4fe13f483242b1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/10x10_coordinate_plane_printable.pdfIn PDF document text
    • https://eff7b67d-fef5-45b7-bcd6-ffb1b71d3a14.filesusr.com/ugd/b4c9df_dfa828d2687f4f4cbb06ece8691d8111.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jovekus/advanced_systemcare_11_pro_full.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/acoustica_mixcraft_9_free.pdfIn PDF document text
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_b1c85e8fedcc4f808220cf87c1a1e88b.pdf?index=trueIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_292e3d289fd14d7a81bd4ad5f6f97a05.pdf?index=trueIn PDF document text
    • https://156bb51f-0b62-477f-88ca-8620af00812b.filesusr.com/ugd/e3ff21_b041b418ae1b45b1a698c16b990fd3ff.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A2E 5300 bytes
SHA-256: 9377de59302cafaf1ce66eaa290f52d5af4e5222ba706036291e18e35085855f
font_01_sfnt_off00016c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C3C 11340 bytes
SHA-256: 1c42c7b37a90652ab1b0704f3a16b62ca4f301b402930888caa1a152343d64db

Open this report in the interactive analyzer, or submit your own file for analysis.