Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de104e5d119c290…

MALICIOUS

PDF

79.1 KB Created: 2021-05-12 23:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d78c769b1be9de3bfa65c801149dce4 SHA-1: 7ac59c07262d854be34838616f143b72c7d9863c SHA-256: 5de104e5d119c290720df1d76c38e8d9761917463d9acb798feb861a58dbdf98
136 Risk Score

Malware Insights

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

The file is a PDF that contains embedded URLs and heuristic detections indicating malicious intent. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan PDF. The presence of 'cmd_window_open' in the document text suggests an attempt to execute commands, likely to download and run a secondary payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://resalured.ru/strik?utm_term=are+all+2015+jeep+grand+cherokee+4+wheel+drive
    • https://static.s123-cdn-static.com/uploads/4470224/normal_5fec20da71e68.pdf
    • https://static.s123-cdn-static.com/uploads/4486745/normal_5fcff2f23017f.pdf
    • https://cdn.sqhk.co/tinulafi/dzfI3gc/free_virus_scan_and_removal_for_mac.pdf
    • https://cdn-cms.f-static.net/uploads/4470689/normal_5fd9e72457366.pdf
    • https://cdn.sqhk.co/dojarodawiw/jhfOohg/meduwe.pdf
    • https://cdn.sqhk.co/mirofifuba/0aNesw5/house_flipper_nintendo_switch_bugs.pdf
    • https://static.s123-cdn-static.com/uploads/4426571/normal_5ffa3f0dcdf5f.pdf
    • http://slmit.fun/lenovo_thinkpad_t420_car_chargerfg2am.pdf
    • https://cdn-cms.f-static.net/uploads/4462993/normal_6052f11c0ee22.pdf
    • https://static.s123-cdn-static.com/uploads/4452381/normal_5ff637f6e3497.pdf
    • https://cdn-cms.f-static.net/uploads/4378848/normal_603743cdc1c28.pdf
    • https://cdn.sqhk.co/vufuvevu/gigjiqy/winning_soccer_evo_elite_apkpure.pdf
    • http://andyhong.blog/batch_file_keep_cmd_window_open7qscm.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/92dcb132-ce29-471c-8ac9-473682f0f017/stephen_king_dark_tower_series_in_reading_order.pdf
    • http://duwujupis.epizy.com/sony_bdve3100_5.1_channel_home_theater_system_manual.pdf
    • http://sumafalonedap.rf.gd/wofirerukesoz.pdf
    • http://wiwolobeduju.rf.gd/kuxas.pdf
    • http://vixekufu.epizy.com/82319999071.pdf
    • https://uploads.strikinglycdn.com/files/2ca1ceb1-c259-4384-94d2-8c2ac3fdc7e2/povopexojud.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_off0000f2c3.bin
a4583303241eccbfd44042b71ebd4106adb368f7218985da582ee2a089fef553		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C3 5976 bytes
font_01_sfnt_off00010739.bin
d9a7f50b898ea36e929ea26402013c9b1c699e7bbd9b0ba80d140ec6dc0cf3a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10739 11404 bytes

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