Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16567508ec2441d…

MALICIOUS

PDF

277.8 KB Created: 2021-01-19 17:04:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 6864745d3b3bd3a4b9409bac9c2f573d SHA-1: 75cb798a1cefe225bf32b5e024aa8ed77723ef0b SHA-256: f16567508ec2441dd994722b4c4d24aca5103c45497280f90828307df9925a46
104 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, identified by the PDF_URI heuristic. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, suggests a lure related to guidelines or manuals, aligning with the SE_URGENCY_LURE heuristic. The presence of embedded URLs points towards a phishing or credential harvesting attempt, likely leading to a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9787

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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://trafffi.ru/aws?utm_term=esc+guidelines+2018+acute+coronary+syndrome PDF link annotation
    • https://site-1172728.mozfiles.com/files/1172728/european_guidelines_hypertension_2018_ppt.pdfIn PDF document text
    • https://site-1166703.mozfiles.com/files/1166703/husqvarna_chainsaw_manual_240.pdfIn PDF document text
    • https://site-1168360.mozfiles.com/files/1168360/average_stuntman_salary_uk.pdfIn PDF document text
    • https://site-1249758.mozfiles.com/files/1249758/the_beatles_1_full_album.pdfIn PDF document text
    • https://site-1201795.mozfiles.com/files/1201795/audio_technica_lp120_user_manual.pdfIn PDF document text
    • https://site-1166042.mozfiles.com/files/1166042/gomewutan.pdfIn PDF document text
    • https://site-1167931.mozfiles.com/files/1167931/slice_raw_meat_food_processor.pdfIn PDF document text
    • https://site-1178588.mozfiles.com/files/1178588/77232064503.pdfIn PDF document text
    • https://site-1247443.mozfiles.com/files/1247443/bitdefender_free_edition_2019.pdfIn PDF document text
    • https://site-1199436.mozfiles.com/files/1199436/ecosystem_in_a_bottle_project_worksheet.pdfIn PDF document text
    • https://site-1182082.mozfiles.com/files/1182082/chuyen_file_jpg_sang_mien_phi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bokonejedebi.rf.gd/reverse_shell_cheat_sheet_github.pdfIn PDF document text
    • http://karifopiti.epizy.com/repojofixoxojexorekez.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/maytag_washer_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/9624550158.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/nepul.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/indikasi_cantilever_bridge.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/xoliwesuxo.pdfIn PDF document text
    • http://lobidirubegevil.epizy.com/bezojinemiz.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/candy_crush_soda_mod_apk_fb_connect.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0003f087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3F087 5836 bytes
SHA-256: 934e484190a558e61e550aa1773758d48a72bc47251501c155eb4aa4c368f2fb
font_01_sfnt_off00040464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x40464 14308 bytes
SHA-256: 526ff1cc349ca29d0f4e58056cf877aa7965e19c6d22b648b31f8df6c173e09c
font_02_sfnt_off0004322a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4322A 16148 bytes
SHA-256: 98bbda09e34957c2c47eea570891e411fa41ced272e9777bbef021ce7395b75a

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