Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e1616dc7eb28b82…

MALICIOUS

PDF

82.9 KB Created: 2021-05-08 19:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e5950b8e28ec6f32f6515cb14d14e5d5 SHA-1: 7c22afcf2be6159188c6c29040fb653b2f6ed429 SHA-256: 8e1616dc7eb28b8244c0040f17d12a6a8f3894d1b983baaacc1b8784c1e52fa7
174 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a ClickFix paste-and-run lure. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/strik?utm_term=dell+venue+8+pro+bluetooth+driver+windows+10 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368487/normal_5fdec760b1002.pdfIn PDF document text
    • https://buritozube.weebly.com/uploads/1/3/0/7/130775753/8695830.pdfIn PDF document text
    • https://gebevomipo.weebly.com/uploads/1/3/0/7/130740462/1595508.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416930/normal_5fe1c18dd49b8.pdfIn PDF document text
    • http://digerutejonoju.22web.org/tuberoda.pdfIn PDF document text
    • https://muputobiga.weebly.com/uploads/1/3/5/3/135308906/tosagamutiseg.pdfIn PDF document text
    • http://baugroup.info/peburojopizarupuximim0mr39.pdfIn PDF document text
    • http://bigmagazin.xyz/blackmagic_atem_mini_pro_iso_setupi0czm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://popewap.epizy.com/maths_blog_8th_standard_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/938a5252-dfb0-47a2-8c8c-53126f00118c/89023737651.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f66cdaaa-c98e-48da-a0d1-5daecbf73a29/how_to_draw_a_childs_face_from_the_side.pdfIn PDF document text
    • http://tefolinum.epizy.com/what_is_a_law_school_student_loan.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/bombs_away_charlotte_gainsbourg.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/what_is_the_beatles_best_selling_song_ever.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7660d7a-3bbc-492f-b15c-e1ff7e7bf9e3/71963614519.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/ctet_prt_syllabus_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/pafugelujiworonuxut.pdfIn PDF document text
    • http://waxozex.epizy.com/nts_dm_answer_key_15_september_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72eb0267-859b-41e3-8f51-933d87727dd1/how_much_is_a_fisher_baby_bear_wood_stove_worth.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_off000106af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AF 5516 bytes
SHA-256: f1e0cbffeba696d03b9a5711e11fd2b822915dc08b58975474caa9fd99523c72
font_01_sfnt_off00011983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11983 10832 bytes
SHA-256: a2b1265570d47f0a66e246202a0c6463008c10ee76e5e9d299dfe3ee651a402c

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