Malicious PDF — malware analysis report

Static analysis result for SHA-256 298d791ea1689b26…

MALICIOUS

PDF

76.1 KB Created: 2021-04-12 06:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee04ec4d60be2684d23f6c5c6c805284 SHA-1: 785eb27a0095752513331ffe8a44912ae32e6a61 SHA-256: 298d791ea1689b26837a2ff0965b4a3c15f7476a6b09ee40b449eb2e54341df8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as document titles, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=can+you+do+secret+orders+on+amazon
    • https://cdn.sqhk.co/ninuxoti/3Ayijib/pulse_oximeter_readings_heart_rate.pdf
    • https://cdn.sqhk.co/xawenano/g0uhi73/esl_ing_verbs_worksheets.pdf
    • https://static.s123-cdn-static.com/uploads/4454813/normal_5fe352a39d93d.pdf
    • https://cdn.sqhk.co/zikegasenar/VicPdge/26360918375.pdf
    • https://cdn.sqhk.co/jowowibow/ztijHge/steam_api._dll_download_windows_10_64_bit.pdf
    • https://rofexelugikovu.weebly.com/uploads/1/3/4/7/134732340/werekipisejazax.pdf
    • https://static.s123-cdn-static.com/uploads/4454544/normal_5fced2202f44f.pdf
    • http://tixshopclub.fun/33_days_to_morning_glory_free_download3vlc5.pdf
    • https://cdn-cms.f-static.net/uploads/4484383/normal_60218ef696c21.pdf
    • https://cdn-cms.f-static.net/uploads/4479462/normal_6042e16bd7ba7.pdf
    • https://cdn.sqhk.co/diwiporeb/LhfiVib/vexokipawawenibonikur.pdf
    • https://lunipudazu.weebly.com/uploads/1/3/4/4/134462877/dca943faef9d.pdf
    • https://cdn-cms.f-static.net/uploads/4386337/normal_605faef2253c9.pdf
    • http://rentline.pro/skyrim_best_load_orderuutu4.pdf
    • http://hookup158.fun/viewsonic_pjd5155_specificationybell.pdf
    • https://cdn.sqhk.co/mijajijem/ejibia0/shoot_em_up_carrot_death.pdf
    • https://cdn.sqhk.co/noxivudeva/kCjhghR/niguzaw.pdf
    • http://artelamp.store/stunt_car_3d_racing_maniacsts5i0.pdf
    • https://cdn.sqhk.co/runudori/Jjgigge/xebojitifibebibifufimiduv.pdf
    • http://policyhelpcenter.com/pioneer_gm-a5602_reviewwi1u4.pdf
    • https://vexefanakaxaki.weebly.com/uploads/1/3/4/8/134871487/5bf5a9af300fea.pdf
    • https://cdn.sqhk.co/mujowofapubi/ihgdhig/stickman_skate_battle_hack_apk_2020.pdf
    • https://cdn.sqhk.co/mepetiruzi/Ojfhcjh/robupatuvufukex.pdf
    • http://predouche.xyz/proposal_acceptance_letter_format_in_wordgzc7c.pdf
    • https://bunoworerut.weebly.com/uploads/1/3/1/4/131438217/090d570e3cc2d7.pdf
    • http://muzoc.xyz/how_to_upgrade_zoom_account_for_free86mt6.pdf
    • http://tokio-2020.fun/14018224507yk1pn.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000ebd8.bin
a2e4e2f1d4bfe3e2a40bdb0e74e0415f34105572d70bdb7668714ba620439d87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD8 5108 bytes
font_01_sfnt_off0000fd2e.bin
971e2db32aed081f5efab0a89c8d646e3f2f07d4cc35b98e7791c49d70a3aa61		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2E 10844 bytes

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