Malicious PDF — malware analysis report

Static analysis result for SHA-256 594b5478c0126f28…

MALICIOUS

PDF

71.5 KB Created: 2021-02-14 02:19:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 36c6bfcda078b1a3ed4d8d45a8b1a786 SHA-1: e22d759e414531c88ecec8aff4c0a4dd515f2983 SHA-256: 594b5478c0126f281b7a71ab33b1108c9525ba4ba0c32c408313a3f8213ce789
154 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or scam document. It contains numerous external URIs and embedded links, many pointing to disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of a 'download button' lure and a 'callback lure' further supports a malicious intent to deceive the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://seumenha.ru/wb?keyword=telephone%20conversation%20worksheets%20esl%20students PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501791/normal_5fdc40a01aa92.pdfIn PDF document text
    • http://topmassage.net/55400168422qeftq.pdfIn PDF document text
    • https://musisemikalig.weebly.com/uploads/1/3/4/6/134694348/9f47df1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378381/normal_5ffbcc00d19b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444098/normal_601484dbeec09.pdfIn PDF document text
    • http://fumigatoff.online/6943866898352nbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481539/normal_601dc83eb3f01.pdfIn PDF document text
    • http://bobr.space/900021371928f6qe.pdfIn PDF document text
    • http://kmikaerfs.ru/cryptocurrency_exchange_platform_github14e3f.pdfIn PDF document text
    • https://salexutoxor.weebly.com/uploads/1/3/4/7/134761189/6665647.pdfIn PDF document text
    • http://tranquils.space/savarese_omt_reviewadrn9.pdfIn PDF document text
    • http://italiahot.space/notes_from_underground_sparknotes2m0my.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403417/normal_5ff36f5717af3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489844/normal_5ff8aa1d3dac0.pdfIn PDF document text
    • http://tk-time.site/payday_2_better_bots_mod8zudp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487906/normal_6022627d2ae34.pdfIn PDF document text
    • https://lomofoxagut.weebly.com/uploads/1/3/4/5/134524577/b74f17e59.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/bugutaj/16029131603.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/xewuxilaxive.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/alien_covenant_2017_full_movie_480p.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_off0000da3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3D 5324 bytes
SHA-256: 65ce9ebdca7c5252cb591612fefd10e05b715d7914a9227f6d3badb4a6ca4b87
font_01_sfnt_off0000ec67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC67 10664 bytes
SHA-256: bb6ab263c240695b2387ec5ea50d2a115ac5c4a625649e4d2f313519133f2ffc

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