Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae99b2b3affa9c3b…

MALICIOUS

PDF

80.2 KB Created: 2021-05-01 12:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9e4bdc693d4e2c79d5bf812d42334300 SHA-1: 68a232ae13824022c719e29e4bebb533b935c366 SHA-256: ae99b2b3affa9c3b6debc36bc8dadf5a1b6c772c501fa1dc6f2fe6f6bde19491
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The PDF contains numerous embedded URLs, with one specifically matching the document's apparent lure regarding 'Percy Jackson books'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to host many links, likely for SEO manipulation or to distribute malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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.
  • 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/strik?utm_term=what+grade+level+are+the+percy+jackson+books PDF link annotation
    • https://wowimenus.weebly.com/uploads/1/3/4/7/134709331/kusiva-lilofimafat.pdfIn PDF document text
    • http://fupuwage.22web.org/69558591774.pdfIn PDF document text
    • https://cdn.sqhk.co/tovitaxani/gdYIibx/49327097459.pdfIn PDF document text
    • http://ig-verifiedsbadge.com/gopro_hero_3_portable_chargerr59cc.pdfIn PDF document text
    • https://cdn.sqhk.co/bamosabubesi/c4Ie3sS/vegimegaviz.pdfIn PDF document text
    • https://cdn.sqhk.co/vizelupavew/ojhighf/98026637341.pdfIn PDF document text
    • https://jabesukugadipo.weebly.com/uploads/1/3/2/8/132814964/1671889.pdfIn PDF document text
    • http://rolevuses.iblogger.org/kojoloj.pdfIn PDF document text
    • https://cdn.sqhk.co/rivotoxupow/idibAhb/jawifekaxu.pdfIn PDF document text
    • https://japarikadag.weebly.com/uploads/1/3/4/1/134108792/3455901.pdfIn PDF document text
    • http://artyom.guru/100_number_chart43xa1.pdfIn PDF document text
    • http://jotijitod.66ghz.com/implosion_never_lose_hope_apk_full_game.pdfIn PDF document text
    • https://lakojelot.weebly.com/uploads/1/3/1/6/131637836/ebba0559f8efec0.pdfIn PDF document text
    • https://cdn.sqhk.co/junigofulum/sie7fhg/iphone_file_manager_for_pc_free_download.pdfIn PDF document text
    • http://xivobivivupe.mygamesonline.org/mathematical_reasoning_practice_test.pdfIn PDF document text
    • https://zikixitifo.weebly.com/uploads/1/3/4/8/134897390/vujosifawibitazasama.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_426c785fa9a248209eb086a430c9db5c.pdf?index=trueIn PDF document text
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_c63c1960839646e582924d9110f610b2.pdf?index=trueIn PDF document text
    • http://sesosufavi.epizy.com/kuranewakapuzamoleniba.pdfIn PDF document text
    • http://tosabukevosubar.myartsonline.com/digital_marketing_interview_questions_and_answers_2020.pdfIn PDF document text
    • http://mowumaja.epizy.com/kilimanjaro_weather_report.pdfIn PDF document text
    • https://d1b6b380-f15b-462b-86b5-0b089ba7d90d.filesusr.com/ugd/f99a33_6fb0360189a048eba71ecbcb3bcfbe2e.pdf?index=trueIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_9a45b94264c94f3cafa6fd4b2ba8b73b.pdf?index=trueIn 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_off0000f6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B8 5792 bytes
SHA-256: 8a6f188eccf818bbe70da0cd1f731d448d6f56a9ff8e19eb786873d45601d55a
font_01_sfnt_off00010a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A82 11492 bytes
SHA-256: 9044ff4d3c15ed6ef0ff4010cab2c65e922f3420b5e982ece3a344ac1af824f9