Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b087fe71d7159b…

MALICIOUS

PDF

85.8 KB Created: 2021-03-09 17:12:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 387c3d86774185a2c945961cd54046bf SHA-1: d25351b7ea9d8bba3087a16870a406a28195c5a6 SHA-256: 25b087fe71d7159b35a2ba38958b89ba0808719d678b0872733a344820e10527
176 Risk Score

Malware Insights

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

The PDF contains a link to an algorithmically-generated URL, which is a common tactic for distributing malicious payloads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may instruct the user to open a password-protected archive, a method often used to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jacksth.ru/award?keyword=cedula+de+identificacion+fiscal+ejemplo+pdf
    • https://cdn.sqhk.co/leloxoreje/h9ysG4H/geekvape_aegis_mod_manual.pdf
    • http://xozonline.ru/ponakox1vgew.pdf
    • http://presentinsta.online/first_aid_step_1_2018frv6a.pdf
    • http://privateguardingserviceagainstdanger.site/756441828svxvu.pdf
    • https://cdn.sqhk.co/tinolefowi/jdUOxYy/42564836144.pdf
    • https://lunisaga.weebly.com/uploads/1/3/5/3/135302545/7337703.pdf
    • https://cdn.sqhk.co/gotuxixovumu/nIchit9/71435905118.pdf
    • https://rejomopoxe.weebly.com/uploads/1/3/1/3/131383333/keromurel.pdf
    • http://mivetys.xyz/490163120538644u.pdf
    • http://sodahq.pro/84_charing_cross_road_film_onlineo8anb.pdf
    • http://birjand.design/midepodisawjamm8.pdf
    • http://nigodofifulo.scienceontheweb.net/hp_elitedesk_800_g1_usdt_ram_upgrade.pdf
    • https://wukelefitifaka.weebly.com/uploads/1/3/4/8/134882985/fisiwamowoxuse-jiworun-todutites-vexapab.pdf
    • http://jabilevij.mypressonline.com/oldways_mediterranean_diet_brochure.pdf
    • http://dalidusiz.mywebcommunity.org/apple_book_appointment_online.pdf
    • http://pushbiz.fun/11267499488uo3kk.pdf
    • https://cdn.sqhk.co/tajiwikiter/ibhdDgc/sniper_3d_assassin_shoot_to_kill_download.pdf
    • http://d2-club.ru/kakowavtvqkv.pdf
    • https://cdn.sqhk.co/nobixapo/RjigdcR/angry_neighbor_descargar_gratis_para_pc.pdf
    • http://biniwitovo.mywebcommunity.org/best_wii_u_replacement_battery.pdf
    • https://xifamileg.weebly.com/uploads/1/3/4/6/134687686/98eeb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0ae1cece-e855-462f-8fb3-e573c9313123/39877560019.pdf
    • http://medazupu.onlinewebshop.net/how_to_reset_my_att_u_verse_modem.pdf
    • https://uploads.strikinglycdn.com/files/79b32ee1-1882-4777-babb-bf1ef8825f4e/67735978358.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f20.bin
c04259b150981f60c8369cb16bc6a88274125a0d385886104090fdb9c9d58acf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F20 5188 bytes
font_01_sfnt_off000120bb.bin
421e0fd6448b49bcc0b10e1133eee37b69c8419a22b282ab371cac4f44bad6e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120BB 11984 bytes

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