Malicious PDF — malware analysis report

Static analysis result for SHA-256 8603e3081cab34cb…

MALICIOUS

PDF

67.5 KB Created: 2021-02-17 11:58:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 81c75a039ac2cee555af4845589d5b71 SHA-1: 032dc618590bee945aa743818ab1455e1b4db0fc SHA-256: 8603e3081cab34cb69fd9ad8b1c9180f607d397ad696bd4ae325f67d58d0cd8c
104 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs and a heuristic firing for a 'download button' suggest a phishing or social engineering attack. The document body, though heavily obfuscated, contains text related to a physics textbook download, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://bologen.ru/aws?utm_term=physics+by+halliday+resnick+and+krane+vol+2+free+download PDF link annotation
    • https://cdn.sqhk.co/xeduwukaxusa/ijfbhFo/shooter_cast_season_2_episode_2.pdfIn PDF document text
    • http://xtreme-sport.ru/free_brush_for_digital_painting8f6wl.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/O6c7hia/clash_royale_hack_app_android.pdfIn PDF document text
    • https://cdn.sqhk.co/xenotami/bgchfjc/racing_fever_moto_apk_download_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/remigalakefo/jhqAshh/xizowamejakosi.pdfIn PDF document text
    • http://electriccannoz.club/mikifaxadunefubemigiwsdwee.pdfIn PDF document text
    • https://cdn.sqhk.co/fulaxanew/eyJAii2/panoripuloned.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/qhhKhat/chicken_sounds_congested.pdfIn PDF document text
    • http://creditstar-kabinet.com/lukajuziwilivajedevenu6u1pa.pdfIn PDF document text
    • https://cdn.sqhk.co/vasozaponem/uihD2jc/minecraft_pocket_edition_online_free_game.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/fipijife/fawufemoxuwopeb.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/division_two_digit_by_one_digit_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/49520438012.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/authorized_representative_form_texas.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/dibegapodumosotelaxo.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/zipekikujiwefaxe.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/krystals_nutrition_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/how_to_hack_a_vending_machine_with_no_money.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/86723640822.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_off0000c67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67B 5700 bytes
SHA-256: 28955b89252a1fc564dfdc282ed55ad25ee1c10b900429a20394ba1040ed75ba
font_01_sfnt_off0000d9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F1 11284 bytes
SHA-256: 754272bb290fe13e58973d58626ce8667a18ec48cd4e9e666d9a8dc6000750cb

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