Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f697d8f6cdf4083…

MALICIOUS

PDF

85.5 KB Created: 2021-05-02 20:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 21c4033a3c5ca10ff0f58318cecf7c16 SHA-1: b457c7fe8d76d071e170e2a2a172a6a416bea50a SHA-256: 5f697d8f6cdf4083c1f9f21776be49b16bdf3b57bc343e28a4a3a569ca4e8905
156 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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=tipos+de+funciones+y+ejemplos+resueltos PDF link annotation
    • https://wobanuwu.weebly.com/uploads/1/3/5/9/135959505/tanag.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/gdCWPYa/master_thief_movie_download.pdfIn PDF document text
    • https://fajesafopumusid.weebly.com/uploads/1/3/1/8/131871419/5219100.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468267/normal_600fc052460a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482009/normal_5fcecf0b61f58.pdfIn PDF document text
    • https://cdn.sqhk.co/tulovixegoke/hfic3ig/imagine_dragons_natural_piano_sheet.pdfIn PDF document text
    • https://zejafopo.weebly.com/uploads/1/3/4/5/134505046/8743574.pdfIn PDF document text
    • https://cdn.sqhk.co/jelasusoved/Ziaibhh/vineripilekepuv.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/jgnTgfm/4_pics_1_word_level_2235.pdfIn PDF document text
    • https://cdn.sqhk.co/samofetob/fjcjfig/simply_piano_by_joytunes_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vavale/bugs_bunny_cartoon_free_mp4.pdfIn PDF document text
    • https://326fbf14-456b-4e2f-a002-c3a90a59f2ff.filesusr.com/ugd/e745be_c6bd4f5053b243ea8ed060690b9cf14d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lawakux/jegikuzaveladu.pdfIn PDF document text
    • https://8860adff-7f0b-4cf3-a358-cdd560dff136.filesusr.com/ugd/625844_1ee1f4ead9e84f0ea23876340885ff40.pdf?index=trueIn PDF document text
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_1376b1c2d31a4e69b42cb1dae7aa7610.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/personalised_50th_birthday_memory_book.pdfIn PDF document text
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_f6c188965a9d42b185d6b9266915d1b9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lovetijif/23664222558.pdfIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_f6a4665d871145fa9579ee623b4577c5.pdf?index=trueIn PDF document text
    • https://6731adf0-0bfb-4e29-9024-dbf0b6c78d19.filesusr.com/ugd/163ed7_d256aafeafbb4b59a4f256530d2be437.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A6 5100 bytes
SHA-256: b7f2eaa1f4595ff3ff7b787edcd2717372019392a29c8974880104146f6637a1
font_01_sfnt_off000111eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EB 12152 bytes
SHA-256: 6c48d4e9875741f77e7b1a1402a5e73f86c2e5ac226cd530f7a406c1e8f25ae4
font_02_sfnt_off00013867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13867 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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