Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9806258db710e0d…

MALICIOUS

PDF

96.3 KB Created: 2021-04-03 01:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 023c3c840b28d9a64ec77b2c5e9bb589 SHA-1: 8c2238a6969e0eefb7b2675716677407ad990a2b SHA-256: a9806258db710e0d1f9aceb97d9c03298a1f7cafe2fa54dff89f7a43067a955c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/award?keyword=qasida+burda+shareef+pdf PDF link annotation
    • https://cdn.sqhk.co/jesisuvov/dhdjhjj/father_and_son_pizza_chicago_il.pdfIn PDF document text
    • http://nutetuxiv.mygamesonline.org/suzuki_quadrunner_250_service_manual_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462352/normal_5fc95dcd26ccd.pdfIn PDF document text
    • https://cdn.sqhk.co/roretuduva/hiT5ibb/xelamirapezifadezokof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465703/normal_5feed3dac6e88.pdfIn PDF document text
    • http://sepuwazedano.iblogger.org/rabixamazenekam.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/WNghJQK/james_charles_merch_color_block_hoodie.pdfIn PDF document text
    • https://cdn.sqhk.co/bewagolene/c7r8MpY/golden_star_theaters.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374957/normal_604f4d03a7799.pdfIn PDF document text
    • http://ruwazelenefago.22web.org/ncert_class_11_financial_accounting_part_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503533/normal_6027240a90a89.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_fe86db778dea40e69922bb4aa90da28a.pdf?index=trueIn PDF document text
    • http://xokeraje.rf.gd/folaziradofed.pdfIn PDF document text
    • http://kavuduvolilazod.myartsonline.com/cpwd_maintenance_manual_2020.pdfIn PDF document text
    • http://rojugukilajix.epizy.com/pabugemoraxil.pdfIn PDF document text
    • https://7be326e9-a1fd-4761-a84c-83c904220737.filesusr.com/ugd/37e945_8aebbba824a24de795e35f105b00c666.pdf?index=trueIn PDF document text
    • http://wegajovekesowor.epizy.com/beyond_good_and_evil_book_download.pdfIn PDF document text
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_afa2da029bc54e759b23aef5971348b4.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00014f1f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14F1F 21440 bytes
SHA-256: ec5e10424c3fa71b7fcfa1a827b4aa12e2707277837eb57f830a162b357530b2
font_00_sfnt_off00011575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11575 5300 bytes
SHA-256: afa80fc4d664a38a3dcd474ced225cbf4ba1f71ae4c4a615c743818ae37aefa8
font_01_sfnt_off00012769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12769 12648 bytes
SHA-256: 0df13cf8e23b9a15f3c259076fbda4a27ab7b52c39fd0f0678223fbeea40b8aa

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