Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfbe89a0413b13e3…

MALICIOUS

PDF

85.2 KB Created: 2021-03-19 07:19:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0e63ad9282ca9142e477dd6a3323ddf1 SHA-1: 51761ef8c8005897824f87a9c5f9e5dc3787c353 SHA-256: bfbe89a0413b13e3d3dbdbca3a558f1131b9a85e8d9b92516a52211b57165e79
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, including one that appears to be a search result for specific book titles, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of embedded URLs and the overall structure point towards a phishing or redirection attack.

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.
  • 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://druttle.ru/award?keyword=elchuri+ayurvedic+books+pdf+in+telugu PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4405660/normal_600450b832263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393036/normal_60129195dfc87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_6036bef8f1c22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494661/normal_602c79ce6286b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365583/normal_60530b8c333ee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_4ca60d2ae1374c5bb9003a81b395451b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/gikakuv.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/vans_old_skool_birch_true_white_mens.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/xekabadix.pdfIn PDF document text
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_bb0743043f494ca695a1e28abc6928b2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ditiruz/friendship_breakup_whatsapp_status_video.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/93850294824.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/airplay_upnp_apk_free.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/ipad_agenda_koppelen_aan_android.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/calculus_cheat_sheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FB 5740 bytes
SHA-256: 08e7ac2a9026c2d43e977228412afa3d25eda376f81aeaec8d8fe22a86fc773b
font_01_sfnt_off00010983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10983 5204 bytes
SHA-256: 98ba9b845d53395079d97bb26072c3fb1cc24e2f131a06d09c6e6646280ff58e
font_02_sfnt_off00011dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC4 12400 bytes
SHA-256: 61aaedfbf36fcf0a76f2b8af290f4044c64557a99799c0a5297ddf3e835993e6

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