Malicious PDF — malware analysis report

Static analysis result for SHA-256 c42a0d61d04fc3b2…

MALICIOUS

PDF

71.1 KB Created: 2020-12-10 18:35:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: fabb56c9b6a667931124639f98a50c28 SHA-1: 164541511e5bab39662a73ac48a01573b8f95514 SHA-256: c42a0d61d04fc3b2286165aa6fc0b814f7e279c1cc6248ec0a505cde7de2c039
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external websites. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically `https://cctraff.ru/strik?utm_term=graphing+quadratic+functions+in+vertex+form+worksheet`. The presence of a link farm and ClamAV detection as `Pdf.Phishing.Trojan` strongly suggests a phishing or malware distribution campaign. No scripts were extracted, but the embedded links are the primary attack vector.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?utm_term=graphing+quadratic+functions+in+vertex+form+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381302/normal_5f8f157a32ccf.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/wokokagegegaxopefus.pdfIn PDF document text
    • https://bikukanod.weebly.com/uploads/1/3/4/5/134583710/gitedupasijigutopege.pdfIn PDF document text
    • https://jafobepajimo.weebly.com/uploads/1/3/4/8/134881918/kugelixa-kuvobikoki-nitalibe-xefit.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/wovitiku/gitodawugurubuviluboluwa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1393b40f1034a5caafdc7/t/5fcecec710aae775715e9ac2/1607388872448/xirojiloki.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/ahmad_faraz_shayari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/168cc1d6-3b7d-437a-b1b2-570d7e0327b3/fijodafomotagoxuwin.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/proof_of_receipt_of_letter.pdfIn PDF document text
    • https://s3.amazonaws.com/lesepapusojifax/roadways_word_whizzle_answer_king.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/gta_san_andreas_radio_stations_mod.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcec925c7866a3da04312cd/t/5fd17184d97b572b89cf2ae3/1607561606612/1535106633.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_off0000c187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC187 5976 bytes
SHA-256: d27829c5d21b29c4f2fa58ee20a5a8e72a2f8e73980c667b9f14800f17409d25
font_01_sfnt_off0000d5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D1 10624 bytes
SHA-256: ead763bd2b09cc5d6e820e6424fe5bb6a3d0c08e7be6ad7b9d30382b81ad9c04
font_02_sfnt_off0000fa57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA57 16060 bytes
SHA-256: 713933360072c9d59346590fad668f98c3603c6d2b72ed941ce85481f6af0b74

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