Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc48d889046ed064…

MALICIOUS

PDF

72.5 KB Created: 2021-03-13 19:07:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b99c4b399ebb08d8a07991ae49c66592 SHA-1: 16d30ac8bbd15de94e5b69d00d15df75da69c521 SHA-256: bc48d889046ed064c697d419f27621d90bffbb5f0d55e1d9ad4bc1f0eea49ab1
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 0.9998

Heuristics 6

  • 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.
  • 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://baarspo.ru/award?keyword=logic+gate+project+class+12+pdf PDF link annotation
    • https://cdn.sqhk.co/xixujipum/nheCibD/tiger_shroff_new_song_video_hd.pdfIn PDF document text
    • http://venolilixe.mygamesonline.org/26438078301.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452835/normal_6010fe25077b7.pdfIn PDF document text
    • http://koreanluxe.com/sutelovajowapezomopopekapgzlm6.pdfIn PDF document text
    • http://help-lnstagram-verifycopyrgiht.com/taruvelezirawuxefoeta2.pdfIn PDF document text
    • https://cdn.sqhk.co/bilanogakiw/nibXiaN/qksms_failed_to_send.pdfIn PDF document text
    • https://cdn.sqhk.co/kekagate/gihhghF/18222437576.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411479/normal_603c765e92db0.pdfIn PDF document text
    • https://cdn.sqhk.co/jiliroba/kAi9if6/90104968605.pdfIn PDF document text
    • https://cdn.sqhk.co/mozigizax/haN2ihA/domino_tricks_to_win.pdfIn PDF document text
    • http://busimaderule.mywebcommunity.org/how_to_start_generac_5000_watt_generator.pdfIn PDF document text
    • http://dororuminaxa.mywebcommunity.org/ciclo_de_krebs_rap_mp3.pdfIn PDF document text
    • http://nipokaxa.getenjoyment.net/buvinobitatoxivejuzalejul.pdfIn PDF document text
    • http://xunopapazugatar.medianewsonline.com/small_compress_ppt.pdfIn PDF document text
    • http://kamefutebiwef.mywebcommunity.org/sedod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_6bfb71b1894d4f17bd3757fc44a75f55.pdf?index=trueIn PDF document text
    • http://jokosen.atwebpages.com/19757093690.pdfIn PDF document text
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_c84f10458e784e6781f6081a31ed6134.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA6 5524 bytes
SHA-256: 9f35d20d2b8751a3e2cd5c19834afa9f8b648112b7fe1d77d8d1009dadba8572
font_01_sfnt_off0000ef95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF95 11024 bytes
SHA-256: ec05fba2761d153ab65dabeaf06650516458a1b1f59174458ea3ef2adb9c2cb2

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