Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90582256cdf503f…

MALICIOUS

PDF

69.0 KB Created: 2021-03-04 21:56:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0fd584fbdfc1a3c56e4e237ca711569f SHA-1: 2251d8d822d59076921945538400091e516ab074 SHA-256: e90582256cdf503f14071ef680329de949d8bdbe14c0e137af34acc9389ff01c
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged the PDF with high confidence. The document body, though partially obfuscated, suggests a lure related to 'Dremel 4000 carbon brush size', likely to entice clicks on the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://yafferge.ru/award?keyword=dremel+4000+carbon+brush+size In PDF document text
    • http://hh666o.site/sojewidalivirofuki08zpa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404108/normal_6012977f6ae18.pdfIn PDF document text
    • https://cdn.sqhk.co/faresawuf/igNTiIB/dr_mario_world_yellow_virus_levels.pdfIn PDF document text
    • https://cdn.sqhk.co/natokaze/mMRiaqu/2_chainz_lil_wayne_money_maker_video.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/BKhbhhh/9035500311.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384155/normal_60144ab5c9ba6.pdfIn PDF document text
    • http://lemumelubijene.iblogger.org/best_small_room_air_purifier_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/laxefotogulo/hjgfXgg/terranova_test_results.pdfIn PDF document text
    • http://aov.one/la_tecia_thomas_weighthx5l4.pdfIn PDF document text
    • http://gujavagidaxo.iblogger.org/free_vpn_hotspot_shield_chrome.pdfIn PDF document text
    • http://jezewujedufeg.iblogger.org/riloziromoxulebogurali.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://familule.epizy.com/mendeley_apa_citation_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab448760-ce5e-4136-995d-514a2868cc4f/virawexo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2387dd8-04f7-41bc-955e-1a063cb3a631/how_do_you_figure_out_body_surface_area.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56781159-254e-478a-b789-ca341bbf2182/miwaduzivosazorotewu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7814a08-16b1-4b1d-9920-486aadd7fe75/dd_wrt_router_ip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51d55209-ac70-4f05-9d13-cf714d1ebf0d/73656287570.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/063e396b-e4cb-432e-925b-58fdfb8b5723/realtek_high_definition_audio_driver_windows_7_no_funciona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afd775dc-0017-44fc-b966-2e1425dc0194/whirlpool_cabrio_washer_e3_f5.pdfIn PDF document text
    • http://fuzuxoluzetirig.rf.gd/buvajezixotizajewet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61dacd73-f752-472a-b407-6fb95717691b/the_scarlet_pimpernel_book_synopsis.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_off0000d209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD209 5456 bytes
SHA-256: db0994811b6d60071036bdb00a4b4b61a14515f65078e668d47009a1112c94ab
font_01_sfnt_off0000e474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE474 10164 bytes
SHA-256: b0a26cbd0556122b1a80258d4168002296390f5bb3ceeba3ad1bc7cb020aa345

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