Malicious PDF — malware analysis report

Static analysis result for SHA-256 e11cdab635975c05…

MALICIOUS

PDF

67.1 KB Created: 2021-03-14 11:33:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: d7fff3c3d5466a0a2ab297af8e96e739 SHA-1: 231564e6466707e58a2e0a7db5aaea8d32799081 SHA-256: e11cdab635975c052c5883f9ce9df086f0d55c7e1e6053ec3f072ed4e9c9b6e1
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL disguised as an 'Android app big red button' download. This URL, 'https://xajibur.ru/123?utm_term=android+app+big+red+button', is highly suspicious and likely leads to a phishing page or malware. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xajibur.ru/123?utm_term=android+app+big+red+button PDF link annotation
    • https://cdn.sqhk.co/kekelivig/cjh7ggK/63182829924.pdfIn PDF document text
    • https://cdn.sqhk.co/daboxazile/d3Whi45/54389163285.pdfIn PDF document text
    • https://cdn.sqhk.co/xipepovivik/ghihFjc/55614429521.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/4jahcih/siwugelesepa.pdfIn PDF document text
    • https://cdn.sqhk.co/wixikinotu/gcigThi/zombie_world_war_2_filmyzilla.pdfIn PDF document text
    • https://cdn.sqhk.co/jakadamalate/zoigRhf/movie_theater_hollywood_fl.pdfIn PDF document text
    • https://cdn.sqhk.co/jomenuluz/ltIeck6/dunonuzix.pdfIn PDF document text
    • https://cdn.sqhk.co/xelajuwodaf/gjUjijb/rumble_fish_sushi_scotts_valley.pdfIn PDF document text
    • https://cdn.sqhk.co/lepowabog/b5hb4gf/cake_recipes_with_cake_mix_and_pudding.pdfIn PDF document text
    • https://cdn.sqhk.co/lisupixiwe/hSRnXYW/tubby_todd_cradle_cap.pdfIn PDF document text
    • https://cdn.sqhk.co/lutotilivik/8z0Dxhg/webasto_diesel_heater_wiring_diagram_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/virurewev/heththa/best_healthy_ninja_smoothies.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e29114b-a414-49c8-9e81-a60bf6ec2dbc/how_to_turn_on_ryobi_trimmer_plus.pdfIn PDF document text
    • http://dulubuli.rf.gd/wefijuguriwimiguzi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e0d407b-a0d7-43ff-855c-35bd2922377a/cual_es_la_estructura_de_un_texto_narrativo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d2c7dde-927b-421b-9c28-201323bbbf82/xokamev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d5c4f98-9879-4a10-8b3b-018747b56cce/how_to_lock_a_panasonic_microwave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d4c7e7f-362e-457a-81cc-47ecf9183b0a/nobemuvamipabowu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f81d938-d3fd-4829-b6d1-31d36500afbb/coleman_lantern_battery_guard.pdfIn PDF document text
    • http://tezuzatarezoz.epizy.com/jutuzobajo.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_off0000cd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7D 5048 bytes
SHA-256: 27ba590f48d24f8c326cd8ba78e49cb27cedc09b253d2c2a04f821d63ac80f17
font_01_sfnt_off0000deaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAF 9364 bytes
SHA-256: 2a0a84791e2cb9dbbe39fc0481bfe30ea06318c62f6f0166f17ec981516fb4ec

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