Malicious PDF — malware analysis report

Static analysis result for SHA-256 45fcd8aeb2036c00…

MALICIOUS

PDF

76.3 KB Created: 2021-05-06 07:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9951be4086490428a99984571c7f1a86 SHA-1: eb451b272fa104c6a9afa509085e81bc15b0ddfb SHA-256: 45fcd8aeb2036c00f952939e4ba6e6e4db56aead247b3cab93f2ee7a7698b041
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9997

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.
  • 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=life+as+a+peasant+during+the+middle+ages PDF link annotation
    • https://ximafirufiwazi.weebly.com/uploads/1/3/4/7/134755441/gesubikigufibenadijo.pdfIn PDF document text
    • https://jiwuzutobaduf.weebly.com/uploads/1/3/4/8/134889186/bemapepugu.pdfIn PDF document text
    • http://tevutubiwij.getenjoyment.net/alphabet_phonetique_anglaise.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404297/normal_606a1082447c8.pdfIn PDF document text
    • https://cdn.sqhk.co/pelopuxi/fiagcH7/log_home_repair_and_restoration_services_inc.pdfIn PDF document text
    • https://rogubadivuna.weebly.com/uploads/1/3/4/3/134337887/8059239.pdfIn PDF document text
    • http://suvuxivenorum.mypressonline.com/54927084909.pdfIn PDF document text
    • http://pewekelexu.mygamesonline.org/90454904699.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496216/normal_5fccfcb720af3.pdfIn PDF document text
    • https://cdn.sqhk.co/wodaximewule/tiakjh3/46053933981.pdfIn PDF document text
    • https://cdn.sqhk.co/toralapiluw/JhjKJdQ/37994854194.pdfIn PDF document text
    • https://resawipodejevi.weebly.com/uploads/1/3/0/8/130814711/6523178.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/nuvukivaxiren/new_chhattisgarhi_movie_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9336f70c-4592-4edf-a8dd-a9b56d246b2e/how_to_solve_a_rubiks_cube_in_3_moves_from_any_position.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e897651c-9a74-4400-b6c8-d2a1332bc559/feminist_criticism_literary_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/461e8a91-8b80-4877-9633-02c96b0ac2ab/13273913482.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/73071402775.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e46a894-8924-4216-bf4a-681da1bff271/sugijike.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/why_does_jpeg_open_in_paint.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/fizumufuguxad.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_off0000eef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF3 5396 bytes
SHA-256: 88458790d2258702690b52baae0a6967d6be6b21c26b2a9a2a3a9780f6efb447
font_01_sfnt_off00010125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10125 10444 bytes
SHA-256: b22269745adeb23bb53d37f6727054946fa0d11556976f77f6a64184002cc4cd

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