Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f196bb8940da88…

MALICIOUS

PDF

74.9 KB Created: 2021-03-22 07:32:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: be1a54b12b04d65784f5abf02613ea74 SHA-1: b57393c56933822dc89f055687d1ca69ade7900d SHA-256: 99f196bb8940da88ab5f6ccc2fa427e424711d0b80177b8062339e3681a84ee5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or redirection mechanism to deliver malicious content. The PDF structure and embedded URLs indicate an attempt to trick users into visiting potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/123?utm_term=format+css+code PDF link annotation
    • https://cdn.sqhk.co/winogolelog/hjOCWge/world_champs_2019.pdfIn PDF document text
    • http://nijepatexosanus.medianewsonline.com/nobakaxexu.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/86263329252.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415768/normal_5fdc507029092.pdfIn PDF document text
    • http://zodelem.mygamesonline.org/what_is_charging_error_1_on_roomba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387035/normal_60387fc1edfc0.pdfIn PDF document text
    • https://cdn.sqhk.co/konumapedowe/Jhghggi/72000388678.pdfIn PDF document text
    • https://cdn.sqhk.co/bisidilit/hhjibih/reigns_game_of_thrones_switch_metacritic.pdfIn PDF document text
    • https://cdn.sqhk.co/lopokevofoti/cJjatha/96982080150.pdfIn PDF document text
    • http://fonixeguga.mywebcommunity.org/99385508996.pdfIn PDF document text
    • http://zijofazasogija.getenjoyment.net/jesus_and_the_word_bultmann.pdfIn PDF document text
    • http://wotedogupowu.sportsontheweb.net/20182131526.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408323/normal_6002457e34ec3.pdfIn PDF document text
    • http://kurametugugu.mygamesonline.org/java_collections_interview_questions_for_senior_developers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mugazukadum.onlinewebshop.net/sibiwoluduzoxalo.pdfIn PDF document text
    • http://koriwironawuva.myartsonline.com/gewova.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/how_to_access_blocked_numbers_on_android.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/dubbed_anime_apk.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_off0000e90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90B 5008 bytes
SHA-256: e703de6a809704cece6d368aff75301ad69fcd024410628ecf66cf7508bb5f1b
font_01_sfnt_off0000f9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F6 10716 bytes
SHA-256: 07da50b543330690a7aa9b12f779838c025521dc8f4641635af51b6439291c16

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