Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ba88edb6ece90f…

MALICIOUS

PDF

75.7 KB Created: 2021-04-20 04:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 12db01304799e9fc298e88b24c3f018e SHA-1: 65b6b7c152e8ed1af7f5dbeb3699c9390889b342 SHA-256: 51ba88edb6ece90f0875d481a988fd32ec635b47c389cb799249594bad5d3791
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users. One prominent URL, 'https://jacksth.ru/strik?utm_term=why+is+dell+laptop+not+charging', is presented in a way that mimics a search engine result, likely to trick users into clicking. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/strik?utm_term=why+is+dell+laptop+not+charging PDF link annotation
    • http://bezprovodov.guru/what_is_mucusless_diet52qur.pdfIn PDF document text
    • https://cdn.sqhk.co/madagijoj/OC7hgX1/pajuvorewogudapupik.pdfIn PDF document text
    • https://bupitubijas.weebly.com/uploads/1/3/4/0/134040922/bubuzuxerojadefujo.pdfIn PDF document text
    • https://wepizowo.weebly.com/uploads/1/3/0/8/130813330/kazoparufewobu_fibojubu_robipoponol.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebesoxu/gjpcJjg/tozogivubimafoduvoge.pdfIn PDF document text
    • http://ital-girl.space/lcp_2_partse4z6e.pdfIn PDF document text
    • https://renezotutumiw.weebly.com/uploads/1/3/5/3/135343322/434a826c69e5e54.pdfIn PDF document text
    • https://kitejunozog.weebly.com/uploads/1/3/4/3/134319277/3184907.pdfIn PDF document text
    • http://najelipopusivut.getenjoyment.net/kifimixifudatavunowug.pdfIn PDF document text
    • http://fesotisifofil.mygamesonline.org/ruud_tankless_water_heater_installation_manual.pdfIn PDF document text
    • http://zaxevef.getenjoyment.net/grade_10_math_textbook.pdfIn PDF document text
    • https://rulotukipaka.weebly.com/uploads/1/3/0/7/130776525/xewinikog.pdfIn PDF document text
    • http://rulajamizap.getenjoyment.net/57041673553.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/ghtZFhc/very_long_natural_nails_youtube.pdfIn PDF document text
    • http://cmbmarketing.agency/fortnite_on_play_storea7ov9.pdfIn PDF document text
    • http://muldwych.com/geometry_dash_2.1_apk_hack_mediafrejt1aq.pdfIn PDF document text
    • http://ranking-se.com/11746270524fa06f.pdfIn PDF document text
    • http://zujuzerawijuk.medianewsonline.com/quarterstaff_training_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/dirajafowevo/jgM7Fge/pijobetamifubata.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/choreiform_movements_pronunciation.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/our_lady_of_the_lake_university_baseball_schedule.pdfIn PDF document text
    • http://laxuzoto.onlinewebshop.net/deadlock_detection_in_os.pdfIn PDF document text
    • http://vepitejususas.atwebpages.com/factors_affecting_durability_of_concrete.pdfIn PDF document text
    • http://nakarajibap.myartsonline.com/fuwuxekekewetanifaru.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/wuleg.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_off0000e8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DE 5452 bytes
SHA-256: 01004a73d94af4598bc48cebfb802f01ac3d81cfdef5a0f8f7df18377dbf7881
font_01_sfnt_off0000fb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB74 11140 bytes
SHA-256: 86ecfb63dfc819eb001b3ba0ef1d3700aecdd82f157b8c9142d74c37fd37b81a

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