Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd77d62209f7afef…

MALICIOUS

PDF

131.9 KB Created: 2020-12-14 14:52:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 9a9dc3c618952c71fd7f2122ff2c35c6 SHA-1: c45d8bbac1400fbafc68fa3916072fbd21edd514 SHA-256: cd77d62209f7afefdefa55db51299de58ef89f1ef83981e58cbc51ab7cfc7dad
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, with one pointing to 'https://trafftec.ru/123?utm_term=krispy+kreme+history+in+the+philippines'. This suggests the document is designed to redirect users to potentially harmful websites, possibly for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/123?utm_term=krispy+kreme+history+in+the+philippines PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421782/normal_5f9fd207c3670.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378621/normal_5fa8a9c0ecc9c.pdfIn PDF document text
    • https://jajoteraluwem.weebly.com/uploads/1/3/4/1/134108878/kamikaworakur_wopixu_kelukotipeb_ludol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382208/normal_5f9372e030954.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370791/normal_5fa36d73e30eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366978/normal_5fba867b52fb5.pdfIn PDF document text
    • https://kodowogokilikid.weebly.com/uploads/1/3/4/4/134466607/gololemijete.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/49b93408-da39-4b64-9df7-c72c1008f972/48498772034.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc757207-2f21-490e-97e9-190943e838eb/zokisebozodikesejowamowi.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/89222231372.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7e69a90-8773-4e61-a22d-ad1099278eeb/26833473079.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/ramigopekesunib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c55d2ef-4829-4837-9c10-c82e42fc87bb/action_racing_collectibles_price_gui.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b01d3a69-5a6d-4cd1-8759-558635e1f10d/96249217550.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/find_the_continents_and_oceans_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/short_a_words_worksheets_for_kindergarten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eae09f5-c6f1-44fa-9585-ec1ee029f8d6/arbol_nacional_de_el_salvador_dibujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4378d233-7bbf-4ca8-922f-b462c2eccf4d/joveroxedijokidamubikalu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001aee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AEE8 5908 bytes
SHA-256: dba7c7dd708e9c205a98d642d9ac0d4cc009486ccb38dad543230241de269035
font_01_sfnt_off0001c368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C368 4984 bytes
SHA-256: 46ca7e2729d0355e0a912fa2c89fb5cc8f1a7cdd0fba168d062c9632224999ba
font_02_sfnt_off0001d43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D43B 14428 bytes
SHA-256: 18ba7c09c711cdc8cbb05b203d1abdcaba8744b5ebd1e293a7455d4750e74477

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