Malicious PDF — malware analysis report

Static analysis result for SHA-256 799f3816e4d3924f…

MALICIOUS

PDF

122.6 KB Created: 2021-03-21 23:30:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 948363020b6bb1fa9ea6e5b5ded7bccc SHA-1: b2292fbabde1c0bba830b4edd42523996d9b7dad SHA-256: 799f3816e4d3924f0ea7ec28461225d20eb803d5b73b40b95755aa57924deb8f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in SEO farms or phishing campaigns to drive traffic to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the presence of external URIs suggests the document's primary function is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://mezovuduw.ru/wix?keyword=conic+sections+problems+and+answers+pdf PDF link annotation
    • http://pipvip.ru/38804304893k910e.pdfIn PDF document text
    • http://zekabor.iblogger.org/prefix_root_suffix_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445103/normal_602713cdb3266.pdfIn PDF document text
    • http://znasila.ru/bamboo_font_stylejeyt6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465719/normal_600a19f82b37e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455194/normal_6039ff54ae54a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374188/normal_5ff3463776286.pdfIn PDF document text
    • http://wegolurubakisud.22web.org/high_speed_3g_internet_browser.pdfIn PDF document text
    • http://amsidgi.xyz/the_song_bluest_eyes_in_texasuneq5.pdfIn PDF document text
    • http://optalpha.com/logistics_and_supply_chain_management_diploma_salary58p3t.pdfIn PDF document text
    • http://goldalbum.ru/273827200235l2m4.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/najipavez/aurora_borealis_wallpaper_android.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/93457669637.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/wipuferak.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/lanobexazexoxefufosadi.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/tamil_tv_apps_for_android_free.pdfIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_bd75c75e2813492f9a7f596c166f1a04.pdf?index=trueIn PDF document text
    • http://buweweja.epizy.com/fekexuponovifuburito.pdfIn PDF document text
    • https://413f70bc-0247-4a04-a3fc-eabb14e2b93f.filesusr.com/ugd/f18ee6_3dcf251ec1bf48e185a816c49af122f5.pdf?index=trueIn PDF document text
    • https://ab737b70-891a-4a1f-8db9-ee548211cb31.filesusr.com/ugd/ce14f3_35231f3202854d06a62447bbd6c88977.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dumupa/angular_formgroup_get_validation_errors.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_off0001a194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A194 5440 bytes
SHA-256: 9f9c46d8ca155aacbba7a64525bf12b0f21a73045a3a16b0334ece46c398a705
font_01_sfnt_off0001b406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B406 11740 bytes
SHA-256: d3f3b2bcb5606313b83a8e28ab0118e2ad461449f783e31842a6165ec86d1c43

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