Malicious PDF — malware analysis report

Static analysis result for SHA-256 d361b4edb58f67f6…

MALICIOUS

PDF

85.6 KB Created: 2021-02-09 08:55:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: dcfdefc3664ae813a1cd5daf1c78df61 SHA-1: 6cc7facab73d1da1ff8bfb28d386b98adfe19f56 SHA-256: d361b4edb58f67f63d9f67cd60e7c9dab3096b3c03160e50455bcae609416fa7
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. One critical heuristic indicates a direct link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF, likely intended to phish or scam users by directing them to harmful websites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wb?keyword=inter%201st%20year%20textbooks In PDF document text
    • http://dakixofib.22web.org/50827994071.pdfIn PDF document text
    • https://cdn.sqhk.co/lapefuxolu/chcjfgc/ezpay_buildings_online_payment.pdfIn PDF document text
    • https://cdn.sqhk.co/zekuxemelop/gieocgd/electrical_load_calculation_formulas.pdfIn PDF document text
    • https://cdn.sqhk.co/gukugifixija/Giihihh/wolf_slots_slot_machine.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/aenhUhh/animal_jam_play_wild_codes_for_items_2020.pdfIn PDF document text
    • http://tujubiluwanodof.22web.org/24931486648.pdfIn PDF document text
    • http://femusawar.iblogger.org/ashtanga_intermediate_series.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://keberugut.epizy.com/sharp_aquos_ga535wjsa_remote_control_manual.pdfIn PDF document text
    • http://nutagegoruzolow.rf.gd/cykler_metro_nrreport.pdfIn PDF document text
    • http://surobufalinaxis.epizy.com/the_catapult_2_mod_apk_latest_version.pdfIn PDF document text
    • http://wosamufudov.epizy.com/zuzowusezew.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/bike_stunt_racing_free_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/gixopotiwuraxavezisi.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/pokemon_game_android_1.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/wakovuduzaguwon.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/85618301050.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/medoron.pdfIn PDF document text
    • http://tidisel.epizy.com/66203935373.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_off0000dfef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEF 5012 bytes
SHA-256: 7473e7e08503b95f80dc78b8b7eab2333be808e3eae2283507a4196b6aa9523b
font_01_sfnt_off0000f11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11B 22828 bytes
SHA-256: 6f47012ad17624149f16fa29471dd8a3062bfb4d81481c48743defcfc7ed8368
font_02_sfnt_off00012479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12479 10612 bytes
SHA-256: d9b520c05b96b59aae4d0f60ddd96987af5dbcd44eef64f5acef9050e2b1bef9

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