Malicious PDF — malware analysis report

Static analysis result for SHA-256 07fbd335df0eb0af…

MALICIOUS

PDF

78.1 KB Created: 2021-03-24 20:58:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9e868d0037a2084eda0c9e92b7c5d7cc SHA-1: 81ad58e83d80f61645806d84b9774c7184c5c10f SHA-256: 07fbd335df0eb0af4a839ac3269ac6fe033342bc1c26458d2d8aa8be772756b8
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a remote-support lure. 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 0.9996

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://jacksth.ru/123?utm_term=logic+grid+puzzles+with+answers PDF link annotation
    • https://cdn.sqhk.co/bikegola/5hbChgj/space_crew_xbox_one_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/tebolugex/jchehfe/90618017228.pdfIn PDF document text
    • https://cdn.sqhk.co/tategupet/gNtgdj7/jorakigoxokufusafi.pdfIn PDF document text
    • https://cdn.sqhk.co/jimavidozeze/9jhOdf4/baxebo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_6014b04eb670c.pdfIn PDF document text
    • https://cdn.sqhk.co/ragojagef/hijyhic/xaxisabevil.pdfIn PDF document text
    • https://cdn.sqhk.co/bisadidizi/iEf2THz/rudapebebulo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413119/normal_60386d6389e95.pdfIn PDF document text
    • https://cdn.sqhk.co/kitolitik/ciawjf9/koridemadebiwevutowula.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/6jjjcYV/cbse_class_9_science_syllabus_reduction.pdfIn PDF document text
    • https://cdn.sqhk.co/nezusoxe/gjfNihB/17114242487.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/iWiciaL/the_wolf_among_us_episode_2_trailer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491687/normal_5ff91cac51c6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449183/normal_5ffe9d3148fcd.pdfIn PDF document text
    • https://cdn.sqhk.co/bukoxomule/djgjcie/hidden_valley_road_nyt_book_review.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/jevopemosod/brain_waves_pro_binaural_beats_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/42080113884.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/leaves_of_grass_by_walt_whitman_free_download.pdfIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_9fe2d8395535437f8f52d1f08c2e17b6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mipeboro/3986311767.pdfIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_e9fb60a4120743119740cfade160d7e0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/descendants_3_imdb_parents_guide.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_off0000f363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF363 5416 bytes
SHA-256: 378fd090d94d52799068ecd145d42826c8746dd006b9d9550ebaf27cc7472213
font_01_sfnt_off000105ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105ED 11004 bytes
SHA-256: 0aba14555f6d83a12a65b6514dce9d340ffbbf95a0693c46947a7048c9f36e22

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