Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ff9d4b71198d86…

MALICIOUS

PDF

67.0 KB Created: 2021-04-05 00:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 435bae20482fdf3720b13d5bfc270ee6 SHA-1: 9b32d589a88b2cd36277b64ee226100d9b4fd2c2 SHA-256: 58ff9d4b71198d8647f704ec06b0b4ae08c742428235408693616073cc761f6a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are hosted on disposable or suspicious-looking domains, indicating a link farm designed to redirect users. The document body, though heavily obfuscated, contains text related to installing a trolling motor, suggesting a lure for a specific user interest.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/aws?utm_term=how+to+install+minn+kota+trolling+motor PDF link annotation
    • http://ehaberdevlet.com/4_pics_1_word_cheat_all_answersa0s5i.pdfIn PDF document text
    • http://kind-insta.site/61990812470sf6iq.pdfIn PDF document text
    • https://xososikanezav.weebly.com/uploads/1/3/4/8/134892973/vunuvarawuwijuj.pdfIn PDF document text
    • http://novugatep.22web.org/8860534688.pdfIn PDF document text
    • http://shopeuro.pro/wajotosegelibefatunwpjk.pdfIn PDF document text
    • https://gazonuzurixe.weebly.com/uploads/1/3/4/4/134485976/fokedote_nuwad.pdfIn PDF document text
    • http://moneymaya.site/annihilation_book_ending_explaineds2new.pdfIn PDF document text
    • http://lukufogud.getenjoyment.net/77461599304.pdfIn PDF document text
    • http://rinujajija.getenjoyment.net/what_is_another_word_for_political_alliance.pdfIn PDF document text
    • https://betepojikimiji.weebly.com/uploads/1/3/0/8/130874485/rewedof.pdfIn PDF document text
    • https://cdn.sqhk.co/mogudekusab/7igX4je/1925561719.pdfIn PDF document text
    • http://kobopez.mygamesonline.org/fosipojijaxufojevudodixa.pdfIn PDF document text
    • http://todomod.22web.org/38990571214.pdfIn PDF document text
    • https://cdn.sqhk.co/jumupebuvi/jgehdOW/39769199242.pdfIn PDF document text
    • https://cdn.sqhk.co/bolukawet/jcjekzS/castle_defense_knight_fight_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nolonogatifotop.epizy.com/gidumexubutawobop.pdfIn PDF document text
    • http://vogutuzalosomo.rf.gd/48237957458.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a2d0fab-3be6-485f-8ebd-b601df658f58/how_do_i_change_my_location_on_google_maps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5db447a-7eff-47bf-b975-7882a48b1a50/daviriwemedemipimu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5165ca24-8db4-4431-b7cd-78e8a9ed264b/are_mcdonalds_or_wendys_chicken_nuggets_healthier.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC978 5124 bytes
SHA-256: c44de7c7914e3b012149a383c8327a23b9a9d9563e4abef38e7a2a8d62c07384
font_01_sfnt_off0000dadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADF 10036 bytes
SHA-256: eb6524328c109bd1b71aa744e4ed3ccd15ee76e04da51157eadd1f97cca4b070

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