Malicious PDF — malware analysis report

Static analysis result for SHA-256 99bd02ff05f7c5ba…

MALICIOUS

PDF

94.9 KB Created: 2021-03-28 09:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b281e04e7c545033b8546e3c1532e3b4 SHA-1: ee0bb7006156b4025c94379544c18500c0cea9cd SHA-256: 99bd02ff05f7c5ba35b2803516636674a7cf0ab01fc9101117bb684762672d41
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The 'SE_CALLBACK_LURE' heuristic suggests the document is designed to trick users into calling a fraudulent number, consistent with callback phishing or tech-support scams. The presence of numerous external URIs, many hosted on disposable domains, further supports a malicious intent to redirect users to potentially harmful content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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.
  • 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://fokemale.ru/123?utm_term=az+corporation+commission+annual+report+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372681/normal_600efc8fef348.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375907/normal_5fef3b8a70829.pdfIn PDF document text
    • https://cdn.sqhk.co/navotezive/hdJhh5r/pandemic_ebt_tn.pdfIn PDF document text
    • http://kugaraginoja.mypressonline.com/nibaxitupage.pdfIn PDF document text
    • https://cdn.sqhk.co/xopuxuvop/XUUXjf9/93875121970.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489050/normal_5fc71e0936423.pdfIn PDF document text
    • http://tideboweped.medianewsonline.com/vedic_astrology_books.pdfIn PDF document text
    • https://dapalirodo.weebly.com/uploads/1/3/1/4/131483520/921fb7a650.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419198/normal_5fd881ba20e33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478123/normal_6016d9eec3e82.pdfIn PDF document text
    • http://lirebuwoke.mygamesonline.org/cambridge_primary_english_learner_s_book_stage_1.pdfIn PDF document text
    • http://dokaxirugik.medianewsonline.com/vevixaridipedase.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/iid8hcJ/photo_collage_maker.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455380/normal_6006fe81767c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487625/normal_5fe286488360d.pdfIn PDF document text
    • https://lijowuvum.weebly.com/uploads/1/3/4/6/134624244/33f412092c4.pdfIn PDF document text
    • http://memiwuv.mygamesonline.org/pdf_splitter_portable_download.pdfIn PDF document text
    • https://koxipaburejoxow.weebly.com/uploads/1/3/2/6/132681725/4917723.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vifidumefitur.atwebpages.com/how_much_does_a_junior_project_manager_earn.pdfIn PDF document text
    • http://pivimufe.atwebpages.com/sbi_bank_po_exam_study_material_free_download.pdfIn PDF document text
    • http://kesupipipiret.onlinewebshop.net/romubunez.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_off00011e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3F 5120 bytes
SHA-256: 6b697a271e94cf940eec763ba2d26d44d772ec560b464e9ab456292ac894b486
font_01_sfnt_off00012f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F97 11948 bytes
SHA-256: dde144299639f315c354562cb72a26873d65ab532c5c28208510af5f3d113dee
font_02_sfnt_off000158c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158C2 16140 bytes
SHA-256: 3f83bbfb2e03141a9083badfb1da6e2b1773f9aa6b1ed8f30fc2d392a5ee3553