Malicious PDF — malware analysis report

Static analysis result for SHA-256 22a7b03a7bff58ef…

MALICIOUS

PDF

90.6 KB Created: 2021-03-23 16:45:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0262b49420c5dbfd3b077ffe34e24fdf SHA-1: 7df2dad99cc8cd474f6cde653b79ba0c92c55263 SHA-256: 22a7b03a7bff58ef42550bcaff5f44e72abd839f5486cf9b33726eab94a8c191
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, appears to be a lure related to technical queries, directing users to a malicious URL. The presence of external URIs and the link farm heuristic strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://gimoguvi.ru/strik?utm_term=how+do+you+remove+a+mercury+throttle+control PDF link annotation
    • http://abreudesigns.com/wikezutakixxydly.pdfIn PDF document text
    • http://badgesverified.com/sony_dvd_bdp_s1200_manual8eepy.pdfIn PDF document text
    • http://azorocheat5.xyz/58244330599t5zfp.pdfIn PDF document text
    • http://zazorin.scienceontheweb.net/asp.net_mvc_interview_questions_2020.pdfIn PDF document text
    • http://raisinslabs.club/syd_field_screenplay_book_summary9qhs4.pdfIn PDF document text
    • http://medyahanem.com/anti_stress_coloring_book_free5991k.pdfIn PDF document text
    • https://bopugokux.weebly.com/uploads/1/3/4/9/134901566/4561979.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380228/normal_5fd907d625735.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402707/normal_60494771e3c7a.pdfIn PDF document text
    • http://tk-pobeda.site/j_rose_a_course_on_group_theory_free_download0el2s.pdfIn PDF document text
    • http://blog-millionaire.buzz/tevibinadevewirupukupb00ar.pdfIn PDF document text
    • http://romeoplanet.club/domizofivejelanugujoutk5z.pdfIn PDF document text
    • http://usacreditreport.info/large_format_film_cameras_ebay_uks0k8d.pdfIn PDF document text
    • http://copyright-helps-team.com/gameconfigadd-on_crash_fix2z4fk.pdfIn PDF document text
    • https://pilinasovoda.weebly.com/uploads/1/3/4/1/134132167/matusix_wajepadexusom_bezuvab_magivezimad.pdfIn PDF document text
    • https://dipitamadupod.weebly.com/uploads/1/3/4/8/134882687/nejup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490376/normal_5fda611f8d735.pdfIn PDF document text
    • http://birapemotafew.mygamesonline.org/74057479918.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/bluetooth_software_for_windows_7_laptop.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/how_to_enlarge_by_scale_factor_2.pdfIn PDF document text
    • http://pidodexogejax.myartsonline.com/kavadakurugiwuzovumo.pdfIn PDF document text
    • http://zevesijuduma.atwebpages.com/preparation_of_benzanilide_from_aniline.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/fajinajibadofedaduxato.pdfIn PDF document text
    • http://gumizaxewa.atwebpages.com/chris_watts_autopsy_report.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/75513157816.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/47495588135.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAA 5216 bytes
SHA-256: 22b4d895ccbe03dc923cc9d44d12174d518149715eb14c6743b5748a3bc65fa1
font_01_sfnt_off00011f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F50 10844 bytes
SHA-256: b3906db4ef7e39398512be9ee254195425c1241228af9266e0b6dca097431077
font_02_sfnt_off00014482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14482 16336 bytes
SHA-256: 92ca5277a07040a1118e6ffe557fff1b4332eaf15e577e4df2dfa25513d903e2