Malicious PDF — malware analysis report

Static analysis result for SHA-256 611e0909a706dda0…

MALICIOUS

PDF

74.5 KB Created: 2021-01-23 09:00:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0ab2c58359dff58464118a3b521d72ff SHA-1: 471f171e5475926418a92c47762b93257836d90a SHA-256: 611e0909a706dda0b76e55b8fdf4868ba07aa38e8b7cb98ceef4e696e730c72e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of a 'download button' heuristic, combined with an external URI pointing to a suspicious domain ('trafffe.ru'), suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains keywords related to downloads, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffe.ru/wb?keyword=drastic%20ds%20emulator%20apk%20download PDF link annotation
    • https://site-1210468.mozfiles.com/files/1210468/46851838389.pdfIn PDF document text
    • http://zinuvudoliku.iblogger.org/google_forms_templates_survey.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384851/normal_5fdb2a15b9b40.pdfIn PDF document text
    • http://ragitikevuwa.22web.org/55823447228.pdfIn PDF document text
    • https://site-1173201.mozfiles.com/files/1173201/zowinamupabav.pdfIn PDF document text
    • https://site-1195301.mozfiles.com/files/1195301/uefa_europa_league_final_prize_money_2018_19.pdfIn PDF document text
    • http://dulexip.22web.org/hpe_brocade_san_switch_firmware.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/sefiwegegagu/accord_aix_les_bains_maroc_france.pdfIn PDF document text
    • http://rojapamun.epizy.com/92260623244.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzakob/createspace_formatted_template.pdfIn PDF document text
    • http://tuvugerij.rf.gd/kitizodinuxoz.pdfIn PDF document text
    • http://natexekazedap.epizy.com/noforenowutewejojoriz.pdfIn PDF document text
    • http://tukozadagafewan.rf.gd/63375682541.pdfIn PDF document text
    • http://mamisiz.rf.gd/nikufinuxedik.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/guide_book_ya_tcu.pdfIn PDF document text
    • http://wosamufudov.epizy.com/jerukur.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/tinoxi.pdfIn PDF document text
    • http://lunijikujapike.epizy.com/36426244435.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCE 2908 bytes
SHA-256: 2bac38d88bff6cb8792db24754903d3a9c22d0a21a0abaa67a99e533602072cb
font_01_sfnt_off0000e62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62B 5376 bytes
SHA-256: 6cd5efe47eaeccdea588b048ba812fc7c701d2f8ab31321f9a77ed5e07542484
font_02_sfnt_off0000f86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86F 10568 bytes
SHA-256: f77352346bfa972d310a0c196044e00fc517a536a5b0fc162226ed63e63e3f4d

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