Malicious PDF — malware analysis report

Static analysis result for SHA-256 82994fc784d8d32f…

MALICIOUS

PDF

75.8 KB Created: 2021-02-25 01:36:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8ff200bec14b5e6f6310e56a348ec901 SHA-1: 1ad81d533db23ca07a03e11ed8a899b5d084cb72 SHA-256: 82994fc784d8d32f9e09b21f4a395fb66084dce8ba56dcd048e5036abc130f5e
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 what appears to be a link farm designed for SEO manipulation. One prominent URL, 'https://leonvi.ru/award?keyword=sapo+y+sepo+un+a%25C3%25B1o+entero+descargar+pdf', suggests a lure related to downloading content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://leonvi.ru/award?keyword=sapo+y+sepo+un+a%25C3%25B1o+entero+descargar+pdf PDF link annotation
    • https://cdn.sqhk.co/gubogezemazo/giaRyhi/destiny_s_child_love_songs_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413583/normal_5fe7255523ae4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447464/normal_5ffb3ff360ee1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470408/normal_5fd233b74e10e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479462/normal_5fedd69444c4e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460946/normal_5ffe93c42c4d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407998/normal_600c48653d529.pdfIn PDF document text
    • https://novadoja.weebly.com/uploads/1/3/4/8/134873208/tolajipogebe_sabapiz_dejamuko_rikinofatavorow.pdfIn PDF document text
    • https://komiwafaka.weebly.com/uploads/1/3/2/7/132712661/xevimabolepa.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/hi2gjTA/bogipatir.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/wjiiiZx/95030207.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445871/normal_5feb97356fdb0.pdfIn PDF document text
    • https://togazozaxezux.weebly.com/uploads/1/3/1/6/131606461/98b8ba2f4f.pdfIn PDF document text
    • https://cdn.sqhk.co/mikedeto/gibihgh/tupac_biggie_beef_timeline.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476943/normal_602c660fa4020.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/kosamupim/55936441410.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/afcat_2019_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/bharat_video_song_tinyjuke.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/kreg_r3_drill_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/64614191521.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/sazezeruz.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/inactive_form_of_trypsin.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/xerox_altalink_b8055_mfp_manual.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_off0000de73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE73 5708 bytes
SHA-256: d6c4b81c648d0fd9f16900619b903cda28ab4d57577fcaf6131c4c911bac196c
font_01_sfnt_off0000f1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B8 14880 bytes
SHA-256: 221e49b597e5aec1e7137b97014f5c4c951cd1bf78f7027711c1aec5907c4136

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