Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfaa97bc8a28bc9c…

MALICIOUS

PDF

74.2 KB Created: 2021-03-09 05:06:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdf0481cca580197df9a1c1b2a108305 SHA-1: a92a2554f19e267b41acb521ac89e4fa96abe52d SHA-256: bfaa97bc8a28bc9c930400f5dbb41fe3b6a8fb68cc31bc2ee4b335b7f3bfa0a4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the presence of numerous external URLs is a primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=amiri+baraka+black+art+pdf
    • https://midamexup.weebly.com/uploads/1/3/5/3/135314938/jajadavoxumuku.pdf
    • https://nitelozam.weebly.com/uploads/1/3/5/3/135308565/a6f71cdf2ad00c.pdf
    • http://pakunobun.getenjoyment.net/69238562772.pdf
    • http://godotobekof.scienceontheweb.net/jowatabozotedexiropapab.pdf
    • https://fekukutetixamam.weebly.com/uploads/1/3/4/6/134636283/1947649.pdf
    • https://pajenugemin.weebly.com/uploads/1/3/4/6/134677616/944d2.pdf
    • http://forajadafogaxuv.medianewsonline.com/top_10_photography_tips_for_beginners.pdf
    • http://xulubapatoso.scienceontheweb.net/william_faulkner_as_i_lay_dying_summary.pdf
    • http://dajexori.mypressonline.com/9843627502.pdf
    • https://bateworolod.weebly.com/uploads/1/3/4/3/134315912/0633be71.pdf
    • https://gujowidupisume.weebly.com/uploads/1/3/4/1/134131448/buxuma.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_9fd288e5add34bc5b8e5de4ab1f0bf8c.pdf?index=true
    • https://s3.amazonaws.com/wunojipu/einthusan_tamil_dubbed_movie.pdf
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_c8a64a887d584b60810b5f464b9dd02f.pdf?index=true
    • https://s3.amazonaws.com/fidefofudi/17495422803.pdf
    • https://s3.amazonaws.com/fajetufekejo/android_app_maker_software_online_free.pdf
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_85ba3a89c56f401db8990725316147a9.pdf?index=true
    • https://7c9e9c40-2b96-4f88-8065-b5ff5e495659.filesusr.com/ugd/3bfcae_1617ee0f9e16458197cf778a3aa636ed.pdf?index=true
    • https://s3.amazonaws.com/zijivevip/videoder_pro_apk_14._1.pdf
    • https://s3.amazonaws.com/mixanaz/21856586090.pdf
    • https://s3.amazonaws.com/veledabejufi/37416582727.pdf
    • https://s3.amazonaws.com/vavale/non_verbal_reasoning_practice_papers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6a8.bin
eeb191ac8bcf1ad132cc07503e471278f8489baa9f81abf8fd6565def86e2554		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A8 5316 bytes
font_01_sfnt_off0000f8a7.bin
b3e39d530e7aed26c1588e813755f68573c8d3069b01c69e560113dfaab12685		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A7 10164 bytes

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