Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b18a5c1de05c0a4…

MALICIOUS

PDF

84.7 KB Created: 2021-02-11 21:26:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 8688748370728e21a8cc3d7573c4e516 SHA-1: 1598e1371d0eae10719351de3adf1274c8c54037 SHA-256: 2b18a5c1de05c0a45451f304f9ea55ab201070439b103db539fb77f74abb7704
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, identified as a link farm, with a high probability of leading to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://leonvi.ru/123?utm_term=what+does+s%252Fo+mean+in+imvu PDF link annotation
    • https://cdn.sqhk.co/lakuxezaj/hdhcXcF/prudential_bike_ride_2019_tracking.pdfIn PDF document text
    • https://cdn.sqhk.co/degawatoze/CHhdSJN/radio_romantica_fm_online_romania.pdfIn PDF document text
    • http://ponarolo.22web.org/10665562044.pdfIn PDF document text
    • https://rapodiduwegez.weebly.com/uploads/1/3/5/3/135311990/87a4acac2863b.pdfIn PDF document text
    • https://cdn.sqhk.co/fasixazijaz/qLjb7f5/86696320629.pdfIn PDF document text
    • http://nitodizej.22web.org/27528984958.pdfIn PDF document text
    • https://wexemexaxixu.weebly.com/uploads/1/3/4/7/134709907/pedebutoma.pdfIn PDF document text
    • https://cdn.sqhk.co/vukobefebu/C7iaBbs/pudenenumazexofomodaru.pdfIn PDF document text
    • https://cdn.sqhk.co/sebidurubuze/fFxhfgg/zewox.pdfIn PDF document text
    • https://cdn.sqhk.co/rufadexu/heHRS9A/jutolope.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480582/normal_5fe10e6318a61.pdfIn PDF document text
    • https://cdn.sqhk.co/tuledapozato/jpribjb/mezifoju.pdfIn PDF document text
    • https://cdn.sqhk.co/pamezuravuno/bjbgeih/wijododo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393639/normal_5ff0c1bccfe72.pdfIn PDF document text
    • https://cdn.sqhk.co/zawukomofise/jT4mlXq/jemowasese.pdfIn PDF document text
    • http://dinejokudino.22web.org/dear_man_dbt_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/nedivixozu/iieitaX/offline_wallpaper_app_github.pdfIn PDF document text
    • https://muvekova.weebly.com/uploads/1/3/5/3/135394778/9b3dd2d8cce3d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9A 4928 bytes
SHA-256: 4f43954a3b3940df5b69cb2d671652cc3673e8ba930c7acec1b547df58bb9e38
font_01_sfnt_off0000f04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04C 2532 bytes
SHA-256: 615f9dcaf073cb3c6d7e875347f08c8d9c6fa92588a01178bf64c271f907819a
font_02_sfnt_off0000fb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5E 10832 bytes
SHA-256: 1995f1d24c8e642e81df4069b95cb827cfe5882d2701410ba2a5203b47b65d8e
font_03_sfnt_off00012017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12017 16544 bytes
SHA-256: 1b44218257806f750c7fedc2cca84b6b30ff477c2da870f9e14c0541087d9c9f
font_04_sfnt_off0001365a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1365A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378