Malicious PDF — malware analysis report

Static analysis result for SHA-256 a29ab23dd3e02903…

MALICIOUS

PDF

169.7 KB Created: 2021-02-16 03:30:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3ad5703d78a73eac09b1c5f15f39d8ba SHA-1: 58831c9b083fc260d2f976d063c2712a4d24cb21 SHA-256: a29ab23dd3e029031af4ea41e0a529b2f114122cfe5f11a817071959c7b706d7
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/wix?keyword=christmas+in+brazil+wikipedia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386594/normal_5fd61a41bef21.pdfIn PDF document text
    • http://wide-take.top/89225042377q3gac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484609/normal_5fd130d0b5e49.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwetebep/gjcgcnw/zegimedipewotalukew.pdfIn PDF document text
    • https://cdn.sqhk.co/mewobonovagi/KBhhTsq/how_to_make_animal_mask_with_paper_plate.pdfIn PDF document text
    • https://cdn.sqhk.co/sebixodof/jjjieji/vulosa.pdfIn PDF document text
    • http://zabavnyi-slon.ru/oxo_digital_leave_in_meat_thermometer_manual86cvm.pdfIn PDF document text
    • http://idealica-official-it.website/52202645698xg9uo.pdfIn PDF document text
    • http://trynutra.shop/fonikuledajor9fw27.pdfIn PDF document text
    • https://cdn.sqhk.co/bexamajuw/Zxfij9G/hidden_object_summer_serenity.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/OhflGxT/hex_star_mod_apk.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/rekawexuretowo/comparing_social_media_platforms_for_business.pdfIn PDF document text
    • http://lipewax.rf.gd/iupac_nomenclature_practice_exercises_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/foreo_luna_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/top_video_editor_app_for_android.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_off00025cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25CFE 5448 bytes
SHA-256: 86dee0115e1b17e1b042115f88100ef64baefe4d48e3ca55a0f820539b06de0f
font_01_sfnt_off00026f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26F64 12516 bytes
SHA-256: 59f408f42933423a0dcf254ac25345ad1955ff6a3f136224bece4035215de066