Malicious PDF — malware analysis report

Static analysis result for SHA-256 da27fa773159797d…

MALICIOUS

PDF

84.7 KB Created: 2021-03-29 04:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a5647e71014f709442a7e04e6aa5b5fe SHA-1: e87f6b2191cd33b8feeed60f32f9b126fd2d4944 SHA-256: da27fa773159797d7efca1be3df632746585bbd78217c2b86cba2f1728c2cd11
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=the+wheel+of+time+amazon+budget PDF link annotation
    • https://cdn.sqhk.co/mudemodox/jU510Od/vidipusazelupav.pdfIn PDF document text
    • http://jamonomikusuka.22web.org/xalokudasigufilopoxoguza.pdfIn PDF document text
    • https://cdn.sqhk.co/nojebimit/xjh3jcl/84402107642.pdfIn PDF document text
    • https://cdn.sqhk.co/wosipuvetot/ihhlnif/renetavizetobutifi.pdfIn PDF document text
    • https://cdn.sqhk.co/nizufalagef/d5sd9Sk/sixoxomofoxetusopekoxomun.pdfIn PDF document text
    • https://cdn.sqhk.co/noviraxat/jehfPja/bayside_milk_farm.pdfIn PDF document text
    • https://cdn.sqhk.co/simikitivo/uWt2ide/cinderella_way_home_apk.pdfIn PDF document text
    • http://didopikorubozav.iblogger.org/how_much_yamaha_clavinova.pdfIn PDF document text
    • https://cdn.sqhk.co/tinipuded/5X4hiia/zombie_diary_2_evolution_ios.pdfIn PDF document text
    • http://pitoxur.iblogger.org/63616146922.pdfIn PDF document text
    • https://cdn.sqhk.co/losegiro/jd7ierS/tiny_trainer_led_kit.pdfIn PDF document text
    • https://cdn.sqhk.co/ponesigis/O6wsJjf/rush_limbaugh_update_august_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/hiidUjf/square_payroll_integration_with_quickbooks_online.pdfIn PDF document text
    • https://cdn.sqhk.co/wasuxuletiz/eZkhhja/wojurapomoruwekixovev.pdfIn PDF document text
    • http://gojoges.iblogger.org/gofelar.pdfIn PDF document text
    • http://jotusuwes.iblogger.org/gixijezemi.pdfIn PDF document text
    • https://cdn.sqhk.co/tifomogoketu/ifCVHSh/glencoe_health_answer_key_chapter_3.pdfIn PDF document text
    • https://cdn.sqhk.co/xovatagemi/mdgeOgh/6159876578.pdfIn PDF document text
    • https://cdn.sqhk.co/tejurorado/igjjthd/revapiletomoxew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://madepug.rf.gd/pagukebaz.pdfIn PDF document text
    • http://ferovugosewago.epizy.com/2280374514.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_off0000fb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB23 5160 bytes
SHA-256: a889d7dbbe445c65dfa8792615c89f0d683fb232906c80f7a3f2e086ae305b2a
font_01_sfnt_off00010ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA2 12252 bytes
SHA-256: f720bbc31fedfc50e3428ddfd4550c7daadf8b2e311cea1b238360326cdbd0d5
font_02_sfnt_off0001358b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358B 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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