Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f006516583a11b…

MALICIOUS

PDF

86.9 KB Created: 2021-03-15 05:12:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0bcac3e830ec5b1c3073eaa32e5f9dcc SHA-1: 09204dcfa829e19a1eaca7c7b018e7dbcb25be0c SHA-256: a9f006516583a11bff6818f7527232e116bd0aca7cb163824f29705b434de0c1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains or subdomains, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites, potentially for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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.
  • 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://mezovuduw.ru/123?utm_term=compound+probability+worksheet+7th+grade PDF link annotation
    • https://cdn.sqhk.co/bobimugura/jedgcjf/final_fantasy_16_site_officiel.pdfIn PDF document text
    • https://cdn.sqhk.co/pulazapusaw/77qjfA5/revolico_camaguey_bicicletas_electricas.pdfIn PDF document text
    • http://fanisore.sportsontheweb.net/19740519379.pdfIn PDF document text
    • https://cdn.sqhk.co/lexaxemiji/iic8jbk/indirect_proportion_worksheet_with_answers.pdfIn PDF document text
    • http://fijubigatusurov.scienceontheweb.net/pesexazululogipene.pdfIn PDF document text
    • http://alcozerox.com/galaxy_note_3_launch_date300wb.pdfIn PDF document text
    • https://wavafawiwex.weebly.com/uploads/1/3/2/8/132815000/def429d3.pdfIn PDF document text
    • https://roxupabepali.weebly.com/uploads/1/3/4/6/134611875/ligirasuja.pdfIn PDF document text
    • https://cdn.sqhk.co/porosobof/pmkFjdG/camera_app_for_laptop_windows_7.pdfIn PDF document text
    • http://fringigejy.site/burnham_gas_boiler_manualhryn4.pdfIn PDF document text
    • https://cdn.sqhk.co/limiwebu/hNjjDij/arcade_fire_everything_now_lyrics.pdfIn PDF document text
    • http://azalea.store/3039369677753ukm.pdfIn PDF document text
    • https://cdn.sqhk.co/wezupobuwab/gemihDv/tidilenaruti.pdfIn PDF document text
    • https://cdn.sqhk.co/zarejesorufo/id7jjjg/sabinuseruzadekevomadop.pdfIn PDF document text
    • https://repugololenip.weebly.com/uploads/1/3/4/8/134880500/5332788.pdfIn PDF document text
    • https://xinulirolome.weebly.com/uploads/1/3/4/5/134599248/mudonipimo.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/geYjd8P/zejinovuwelelezomedi.pdfIn PDF document text
    • https://cdn.sqhk.co/guledijuxi/ijhegg3/are_seasons_the_same_worldwide.pdfIn PDF document text
    • http://fishland.store/kiplinger_retirement_report_change_of_addressjm7j7.pdfIn PDF document text
    • https://nipokilalupa.weebly.com/uploads/1/3/4/4/134485501/8046835.pdfIn PDF document text
    • https://nugivukowunel.weebly.com/uploads/1/3/4/0/134041243/xapes.pdfIn PDF document text
    • http://form-copyrightservices.com/what_unis_look_for_in_a_personal_statementwygxg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000fb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB96 5756 bytes
SHA-256: a83613c220514a4c1b5356c96c955d3f936a7a5ce44b064ffd9d64d4acbed888
font_01_sfnt_off00010f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0F 11652 bytes
SHA-256: 7977931df2379ad79a4e92a5d4c561155d4942af18e161adb3e9c4746dc9c9c8
font_02_sfnt_off00013709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13709 16132 bytes
SHA-256: 60f53b17f7925ac1818ac9336ea58fd206fea48872b5377b70e6fb8114080afd