Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f077106fb87c4cf…

MALICIOUS

PDF

78.0 KB Created: 2021-03-01 03:18:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 653cc346255b17faa159a1881bcd5b0e SHA-1: 9a3537ddf6a6df9f17eb4973c8e91bbc195839d6 SHA-256: 4f077106fb87c4cf2bc2d25d5d43d965f872f703217d896b31fba5a114aa7ea6
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://fokemale.ru/aws?utm_term=how+to+download+offline+dictionary PDF link annotation
    • http://wegansit.space/fundamentals_of_logo_designmjoch.pdfIn PDF document text
    • http://rumurel.mywebcommunity.org/smart_board_online_activities.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/0hchghg/my_movies_and_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/gisatajofo/ijg8eig/mudit.pdfIn PDF document text
    • https://niforowekid.weebly.com/uploads/1/3/1/4/131406966/3b1ee60c5c3bd0.pdfIn PDF document text
    • http://dkblogin-de.com/58587276927r0yfo.pdfIn PDF document text
    • http://app-3null.com/nexedelotowasodezozotdj28.pdfIn PDF document text
    • https://bikigevoxepasi.weebly.com/uploads/1/3/4/7/134716722/04ffce.pdfIn PDF document text
    • http://digovin.getenjoyment.net/hp_laserjet_1320n_service_manual.pdfIn PDF document text
    • http://rujisuki.mygamesonline.org/star_wars_books_canon.pdfIn PDF document text
    • http://alsamcctv.com/bidozimapivi7278h.pdfIn PDF document text
    • https://faripolugariwel.weebly.com/uploads/1/3/1/4/131453512/709c11bc096.pdfIn PDF document text
    • https://cdn.sqhk.co/vubiwete/hhyEjh7/spinning_ballerina_illusion_gif.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/what_is_big_data_and_analytics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wotidupodugi.myartsonline.com/technical_drawing_software_for_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/90549691029.pdfIn PDF document text
    • http://nojikigor.myartsonline.com/26379241260.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/12732008307.pdfIn PDF document text
    • http://lojabupabavize.onlinewebshop.net/49023600547.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/sowosokobolir.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/steam_restarted_after_finishing.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_off0000f48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48D 4992 bytes
SHA-256: 83149c29baa9208c8ab5b3bee57ebd0a2f943edfd21fdb61d65e9986885b0ce2
font_01_sfnt_off000105b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B3 11204 bytes
SHA-256: 097d6dab3a1b1e9795ea9e031579f310b5b847176c9dfdd03cb0f6c657962055

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