Malicious PDF — malware analysis report

Static analysis result for SHA-256 a055012e288a7174…

MALICIOUS

PDF

77.7 KB Created: 2021-03-02 06:49:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2393866bfb2c54d7121d8ab062f815f6 SHA-1: 88b79b1903c0eb20d6ae4a33d042ee6973e8594b SHA-256: a055012e288a717445ad2e69623ed2fd5f3e46c17a88540d296a26c88899d51d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site, aligning with T1566.001 (Spearphishing Attachment) as the likely initial access vector.

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://xajibur.ru/strik?utm_term=which+certification+is+best+for+software+testing PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445338/normal_5fc5d3d925bf4.pdfIn PDF document text
    • http://setokanekema.mygamesonline.org/casio_f-91w_alarm_off.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485172/normal_60293127e282f.pdfIn PDF document text
    • http://fruitnaturs.space/the_lottery_short_story_questions3you8.pdfIn PDF document text
    • http://fineagencyy.com/95483137917jedue.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxinugokas/9NxjttE/vipegafogelafopad.pdfIn PDF document text
    • http://de-bewertung-id2842384.icu/powerwolf_blessed_and_possessedflv0b.pdfIn PDF document text
    • http://rumigiwataj.getenjoyment.net/root_word_dictionary_greek_and_latin_roots.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/graco_solano_crib_manual.pdfIn PDF document text
    • http://masotudulajipi.22web.org/how_can_i_share_my_facebook_video_to_instagram.pdfIn PDF document text
    • http://toppiksnack.xyz/kigudotikamatorupuwovkqz8.pdfIn PDF document text
    • https://cdn.sqhk.co/kavonalitego/idjgjbq/remadevomazesov.pdfIn PDF document text
    • https://cdn.sqhk.co/soboxuxafiso/dgf9j8z/talking_santa_meets_ginger_online.pdfIn PDF document text
    • http://smilex.club/unicorn_gundam_02_banshee_norn_instructionswut7h.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/cnhh8fC/51591460853.pdfIn PDF document text
    • http://goligofalu.medianewsonline.com/harry_potter_free_book_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pujumek.myartsonline.com/sabitegatajarojex.pdfIn PDF document text
    • http://kadoxosin.atwebpages.com/az_driving_test_questions.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8A 5356 bytes
SHA-256: 42a653e5ccc0346b5a4bbff683c9891de2c1bbaa4b1e952f95895f98d2849cb6
font_01_sfnt_off0000eddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDC 10916 bytes
SHA-256: 8bf1db5fcc927cff1ee8f890bd985b9de58856478747e2734fe6abe938daa293
font_02_sfnt_off0001131a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131A 16376 bytes
SHA-256: 069f5cdcb972b33999f3dc18a3e5b847fc2aa024b7c5b45b4734cedf253a8e5c

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