Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b3e8dddaa428f2…

MALICIOUS

PDF

81.0 KB Created: 2021-03-15 13:04:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d72c43d7e0575e63861515216b19fc6 SHA-1: 885cc0428b2b2abef249ce18e115002fa341c1b2 SHA-256: 81b3e8dddaa428f28854c2b14629e2d2819633af9c6ecec8b14f764f23ca063e
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URI pointing to 'golowaki.ru', which is likely a malicious domain used to host a phishing page or download a second-stage payload. The document body, though heavily obfuscated, contains keywords suggesting a lure related to an 'initiative'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://golowaki.ru/wix?keyword=mythic+improved+initiative
    • https://cdn.sqhk.co/sozodumupof/iK8yfgh/roblox_studio_apk_download_iphone.pdf
    • https://cdn.sqhk.co/jivonaxadu/enggfUI/skywars_map_download_free.pdf
    • http://fisijowizaraxot.iblogger.org/ceramics_tools_study_guide.pdf
    • https://cdn.sqhk.co/wusoxopejezo/3jCNjey/jungle_clash_mod_apk.pdf
    • https://cdn.sqhk.co/kosadara/i3Myhho/acacia_wood_cutting_board_bacteria.pdf
    • http://wozutujetotox.iblogger.org/health_benefits_of_green_tea.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/bdd2b8be-9d99-4bef-b885-34b9194339a9/pioneer_vsx_530_k.pdf
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_d4dcef59fbe140b7965dd3b1edf5317d.pdf?index=true
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_c97e1a542b1d4381bd71e9165ef17034.pdf?index=true
    • https://uploads.strikinglycdn.com/files/99b552d4-049b-43ef-bdf1-6e94530439b2/82169488044.pdf
    • https://s3.amazonaws.com/tesasubawalozan/datenika.pdf
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_ecf5e4a9e4c9412c97557ba81d6f7234.pdf?index=true
    • https://s3.amazonaws.com/zarusegibitumet/apocalypto_hollywood_movie_tamil_dubbed_hd.pdf
    • https://s3.amazonaws.com/jidosatikim/mowedemodametisixa.pdf
    • https://s3.amazonaws.com/ruzumeb/tapumet.pdf
    • https://uploads.strikinglycdn.com/files/69422beb-ba34-4e94-aa4e-a6197c6fd9e4/6591873470.pdf
    • https://s3.amazonaws.com/fojaxexino/sex_and_the_city_cast_movie_2016.pdf
    • https://uploads.strikinglycdn.com/files/e1c548d1-3450-46a9-b80e-9141ba55e583/17017598381.pdf
    • https://86146b48-cf95-488a-b5a0-22832f4589a6.filesusr.com/ugd/3b4eee_2dd85447e40a42418f6a5cf9585d2534.pdf?index=true
    • https://s3.amazonaws.com/gezetega/52993636714.pdf
    • http://zuxifeka.epizy.com/57409151718.pdf
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_bc95c715d18f4968a298112f7027813a.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efb1.bin
51bcbdd78229567eee220c8e2161805743bf70117cc81689cc67baa2c2ea22d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB1 5056 bytes
font_01_sfnt_off000100bb.bin
9b0e54b1cc66e6df1b97b8241f8ef8a48a9e501aa898e439e1f82ea0e81fe933		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100BB 11892 bytes
font_02_sfnt_off000128a8.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128A8 4324 bytes

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