Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d773e2071ee88f…

MALICIOUS

PDF

83.7 KB Created: 2021-02-25 23:45:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 68da64f936d82872e3d567e9c8ac3c05 SHA-1: 0d03edbc6a31bb76bd9dd98d573230300d3b6d77 SHA-256: b9d773e2071ee88fe38a616c615a6fe0befbb24f5fb3fd63d09450779ed32a90
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate malicious intent. While no scripts were extracted, the PDF structure and embedded URLs suggest it's used to redirect users to potentially malicious websites, likely for SEO spam or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=fire+emblem+heroes+summoning+guide+reddit PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408174/normal_5fc82e9557ee1.pdfIn PDF document text
    • https://sozuxeboniwuk.weebly.com/uploads/1/3/1/3/131381135/6972c4711573bc.pdfIn PDF document text
    • http://copyrightsupporthelpcenter.com/kovuxerozuburowaxataj3tvk9.pdfIn PDF document text
    • http://faceit.su/51248241598o8y93.pdfIn PDF document text
    • https://dotuxebi.weebly.com/uploads/1/3/1/4/131454754/7782186.pdfIn PDF document text
    • https://mimudokax.weebly.com/uploads/1/3/4/7/134742140/3163503.pdfIn PDF document text
    • https://makezuxakoje.weebly.com/uploads/1/3/0/7/130739015/getazavakibipiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gozilum/alphabet_in_german_language.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/fajezezorepujujepe.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/betimadogunaw.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/2308688927.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/nisosutusawizabi.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/voramar_formentera_pujols.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/new_bhakti_audio_song.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF720 5124 bytes
SHA-256: edbb80185f4ba797b3f778a0004338c58749d6bdc6a76b84a3926107be009871
font_01_sfnt_off00010859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10859 10412 bytes
SHA-256: 3e9da6a70a730de3a034f5acfbaedd759f1406073d337f5cc05ac9b469b55334
font_02_sfnt_off00012c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C30 16096 bytes
SHA-256: 61761e6c71fdd980502ce8a3a8cbf9590216241eb9eabe72fdf309a1c23cd3c2

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