Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c6397f7652b4b2…

MALICIOUS

PDF

80.1 KB Created: 2021-03-22 07:37:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3d0f7360a617f676cc41463774b79f31 SHA-1: d14a9da13cd1e88d9a182c9248204ce3c81207c6 SHA-256: 55c6397f7652b4b2d34f18945211b7824d8773c2b9d35acf280bf27e759ca6dc
166 Risk Score

Malware Insights

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

The PDF document is flagged as malicious by ClamAV and an ML classifier, and contains multiple heuristic firings indicating suspicious external links. The document body, though partially corrupted, suggests a lure related to educational worksheets. The embedded links, such as http://talemine.getenjoyment.net/supercalifragilisticexpialidocious_broadway_sheet_music_free.pdf, are likely intended to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://bologen.ru/wix?keyword=erosion+and+deposition+by+flowing+water+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/bokupajokim/jihiaia/zoralekorugogulotaw.pdfIn PDF document text
    • http://cg-designer.xyz/xavexapazemalugudovxrfiv.pdfIn PDF document text
    • https://cdn.sqhk.co/goworonol/3hbijjh/free_streaming_apps_for_android_tv_box.pdfIn PDF document text
    • http://talemine.getenjoyment.net/supercalifragilisticexpialidocious_broadway_sheet_music_free.pdfIn PDF document text
    • http://libralab.digital/download_foxit_advanced_editor_portablez2v6i.pdfIn PDF document text
    • http://kozidozilujivox.getenjoyment.net/rediwosilokeniguwe.pdfIn PDF document text
    • https://cdn.sqhk.co/wufotubi/jXiiobc/soul_hunters_wiki_heroes_guide.pdfIn PDF document text
    • http://helpcenterbusiness.xyz/integra_dtc_9.8_firmware_update5p2nt.pdfIn PDF document text
    • http://puvinizozibejir.mygamesonline.org/toxalametilodunubuw.pdfIn PDF document text
    • https://cdn.sqhk.co/wenejusuzixe/heuRUij/befoforurami.pdfIn PDF document text
    • http://igclienteam.com/12730806561zej2f.pdfIn PDF document text
    • https://cdn.sqhk.co/waxolulum/fhiHuGo/falokonabad.pdfIn PDF document text
    • http://astrohelp.space/stoner_john_williams_synopsisp0wz5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lakadutof/how_to_put_password_on_photos_app_iphone.pdfIn PDF document text
    • https://e2685184-9bcc-4d63-b126-5f7cf6655de3.filesusr.com/ugd/267f13_69c6e11d85564baa8175b29acd1ae4ea.pdf?index=trueIn PDF document text
    • https://90ff81fc-98d9-4e53-96a3-aaa5c1c2042e.filesusr.com/ugd/bb5aff_5784d2ce51484b0caa5d8858952b702b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sitok/how_to_ask_someone_for_a_letter_of_recommendation_via_email.pdfIn PDF document text
    • http://paguxesij.myartsonline.com/nuladesimisopasogawazow.pdfIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_b9b33dcb39d74b02a56386f9749e4fef.pdf?index=trueIn PDF document text
    • http://gakamaxoluzes.atwebpages.com/jotogub.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/daily_reading_comprehension_grade_7_answers.pdfIn PDF document text
    • http://widusop.atwebpages.com/7th_grade_math_word_problems.pdfIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_9c478065e9ed40f580d946f2461b7317.pdf?index=trueIn PDF document text
    • http://malejubu.myartsonline.com/dieta_cetogenica_definicion.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_off0000f766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF766 5656 bytes
SHA-256: 8a02667756c7767e6ff5f0b48347a60586c3a72958dd8174147003b647ac9852
font_01_sfnt_off00010ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB8 11180 bytes
SHA-256: 5a2b7c0027cbc76e467c57a1d603f2dd3430713093c8bcd94913d8d0660693f1