Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8d2c9f438277c9…

MALICIOUS

PDF

79.4 KB Created: 2021-03-29 02:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 53da6757683e2ff8aab808f579c157aa SHA-1: 9f48c33d5ede41add7c48b193622b2147f110c41 SHA-256: ac8d2c9f438277c91318dc43692af9e9730f0c70ab766b8e663a1fca881bf154
144 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an external URI pointing to a URL that appears to be a lure for downloading content. The presence of a LOLBin token sequence suggests an attempt to execute commands or exploit vulnerabilities within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gimoguvi.ru/award?keyword=atoms+and+molecules+notes+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412593/normal_604fd606a7181.pdfIn PDF document text
    • https://cdn.sqhk.co/wipedekis/gdWbMsp/family_game_packages.pdfIn PDF document text
    • https://cdn.sqhk.co/bomoxale/hhghic6/66607272579.pdfIn PDF document text
    • https://cdn.sqhk.co/gusoguribus/7iahdjf/classic_chess_sets_wooden.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475209/normal_6046fc807525e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485296/normal_5fd0627726463.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/hi7gfjg/black_men_s_curly_hairstyles_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383928/normal_60257bb0f0687.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
    • https://s3.amazonaws.com/dovulavavo/sixepej.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/the_maze_runner_2_book_online.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/nuwem.pdfIn PDF document text
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_5de34d6298834bfcba4d5d99f8ed4f4b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9df39084-de47-417f-a313-6b388959c0d9/la_divina_comedia_resumen_corto_del_purgatorio.pdfIn PDF document text
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_8c5217bb0acf47648a5f6bd1a6373af8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/polaris_lance_destiny_2_guide.pdfIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_1d284336114c44a7a14bfedfad584a58.pdf?index=trueIn macro / runtime command snippet
    • https://uploads.strikinglycdn.com/files/6c21a22c-62fb-43e9-b770-d45b97372c22/sony_rx100_iii_price_malaysia.pdfIn PDF document text
    • https://a8fdb364-3865-4521-a36b-e12f4de7752f.filesusr.com/ugd/e20637_2c457902e2314971b34d9a031afeeda6.pdf?index=trueIn PDF document text
    • https://b73db3ac-2e3c-475a-83ab-7f4668f00a8f.filesusr.com/ugd/80e8fa_70e4b5a9b277427dbc8da2180081ac4f.pdf?index=trueIn 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
    • https://s3.amazonaws.com/dobikasukIn macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA63 5120 bytes
SHA-256: 1fe096fe328b17217be09847d546a6f42332786e2878c288dc350c8fbd6cc496
font_01_sfnt_off0000fbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCF 11176 bytes
SHA-256: 21d43aaaaed3260bcd2a2707b74bba36b6946e4f046a5fe0765c572381ff1100
font_02_sfnt_off000121f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F7 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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