Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab913fad0781e76…

MALICIOUS

PDF

74.3 KB Created: 2021-03-03 08:27:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 4c62b16532a3b213d501dca58bfaa6a9 SHA-1: 34959c704ffdc92fabd4a9b482ae47bfa37c12b9 SHA-256: 4ab913fad0781e76fc152d778228336bcd02573d326dac1d175ab76abaf57eab
164 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 are hosted on dynamic DNS services or appear to be part of a link farm, suggesting a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

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.
  • 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://botokaw.ru/strik?utm_term=how+to+freeze+frame+in+premiere+pro+2020 PDF link annotation
    • https://romiwewigases.weebly.com/uploads/1/3/2/6/132682929/xomefofugelu.pdfIn PDF document text
    • http://tizorudaredan.iblogger.org/biblia_reina_valera_1960_amen_amen.pdfIn PDF document text
    • https://zovipimisog.weebly.com/uploads/1/3/1/1/131163747/8173905.pdfIn PDF document text
    • http://visunuduxat.mypressonline.com/lotebix.pdfIn PDF document text
    • http://center-about.com/how_are_c3_c4_and_cam_leaves_similaream4m.pdfIn PDF document text
    • http://itsnat.space/30708413099b74x6.pdfIn PDF document text
    • https://risovokoxenixe.weebly.com/uploads/1/3/3/9/133997247/japogutitupedug.pdfIn PDF document text
    • https://rukinuzozumar.weebly.com/uploads/1/3/4/0/134012371/riroziru.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/1368601100koh2c.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/74346998530.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fusuxitizubuka.epizy.com/12512893296.pdfIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/sony_playstation_vita_slim_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/darker_side_of_the_moon_sphinx_answers.pdfIn PDF document text
    • http://rijujala.epizy.com/gusapipamesenam.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/ceragon_ip-_20n_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/android_8._0_oreo_iso_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/carcassi_guitar_method.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_off0000e5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F6 5212 bytes
SHA-256: e1cc193c508824c49a922577aec85c65c188860e17f9ed5ceb7031245634e6d5
font_01_sfnt_off0000f7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B5 10524 bytes
SHA-256: b48a83dccd6ee8fe3fd50d20387fe67694143fd62f7e8ee1c71dca658df9f97e

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