Malicious PDF — malware analysis report

Static analysis result for SHA-256 10dc14dedb900606…

MALICIOUS

PDF

79.9 KB Created: 2021-05-18 11:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ab10a7185de20525203c141a78e36cfe SHA-1: 7a5572c3dfd7ea512b100b0c71ae27658e88af80 SHA-256: 10dc14dedb90060669b13f9a1d496fb8e43371bb80a25749ae999bee5116c187
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a heuristic firing indicating it is a phishing lure using an image to redirect users to a malicious URL. The embedded URL, https://seumenha.ru/strik?utm_term=how+to+clear+search+history+in+gmail+app+iphone, is presented as a search result for a common query to entice clicks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=how+to+clear+search+history+in+gmail+app+iphone PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463794/normal_60637164a8192.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481516/normal_5fea2806b681b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420930/normal_604a921352b1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388819/normal_6051f24a5b6b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385853/normal_604d033b35700.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402951/normal_6010e16627958.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417306/normal_6058625a1fff9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413564/normal_5fe68c4a30d92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475376/normal_601cffe338ced.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/justify_your_answer_en_francais.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/pepomomapegefol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83c7b80c-ce7c-447c-957c-3a9cc1f92a75/roziw.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/class_11_english_grammar_practice_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26257382-8ef4-447c-a962-eabe92c1b3e1/raymarine_e120_for_sale_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1e592f9-9814-4ff1-b505-764db012c1de/digital_design_6.5_door_speakers.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/jspdf_autotable_cell_width.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/wd_my_cloud_ex2_ssh_login.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/bijuzow.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/neo_bomberman_game_free_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7627bef-8992-4e85-82d3-5fd9cb3ab865/skywalker_trampolines_14-foot_trampoline_with_wind_stakes_purple_weight_limit.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC2 5288 bytes
SHA-256: ae9e5321da79e41e9ac1daebacef77e6eba1d9bc8e63270f218af24a2f7a6d3b
font_01_sfnt_off0000fd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9E 11440 bytes
SHA-256: ac2e2247fc40e8d8929c244bf0e8feb210226bee7e2f03ce4fbbe4824473651f
font_02_sfnt_off000123ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EE 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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