Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a8e5ac7c56c854…

MALICIOUS

PDF

86.0 KB Created: 2021-01-23 07:19:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c0e76243c88cbd483ee37f15fb355fb0 SHA-1: 21ff988ac19bd4c1b2ea5bbbe3b768eb49f18056 SHA-256: c4a8e5ac7c56c8540eee36d57db1868a10d6070f7ba8a8828baca72897520273
214 Risk Score

Malware Insights

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

The PDF contains numerous links, with one specifically identified as a known malicious redirector. The heuristic firings indicate the PDF is designed to link to external content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/123?utm_term=engineering+mechanics+volume+2+dynamics+5th+edition+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4530036/normal_5fd06f9a3a1b5.pdfIn PDF document text
    • https://cdn.sqhk.co/garoresolif/hjgmn0E/84591196015.pdfIn PDF document text
    • https://sexaxekeka.weebly.com/uploads/1/3/5/3/135313825/419999ab6.pdfIn PDF document text
    • https://bajorenurelop.weebly.com/uploads/1/3/0/7/130739037/8fa0d805d91267a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385436/normal_600ba4be84166.pdfIn PDF document text
    • https://vomenipof.weebly.com/uploads/1/3/4/5/134585177/bc0200c91873.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489615/normal_5fdcea0c27919.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/hig4ia3/pawevipiw.pdfIn PDF document text
    • https://cdn.sqhk.co/libodinidep/XAnhdjU/minecraft_ben_10_omnitrix_mod_download_pc.pdfIn PDF document text
    • https://jikurufor.weebly.com/uploads/1/3/4/6/134613562/9da39.pdfIn PDF document text
    • https://cdn.sqhk.co/zovifesojeme/6hpjcjh/skate_art_3d.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/bezutu/brackets_punctuation_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/5500497329.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/xivepaferiniw.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/41797608231.pdfIn PDF document text
    • http://kesobikifa.epizy.com/44561377544.pdfIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/demepesemesaduperarovek.pdfIn PDF document text
    • http://gusalixofunek.epizy.com/78092816544.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011874.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11874 28632 bytes
SHA-256: 7bd01c7424a7c6838eacbedffc60483f90228577bebc040021170366a12fd050
font_00_sfnt_off0000d3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C3 5944 bytes
SHA-256: 23d23dad798881ea08f073111704e11e2ecc699478190a391cf024cb27b3c54f
font_01_sfnt_off0000e7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EC 4856 bytes
SHA-256: 4475b7a941b5efbe7b71283588644acd632a92c080ceb1e88df1a2a5f6ff9992
font_02_sfnt_off0000f515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF515 10484 bytes
SHA-256: 10f0a24a96ed3fef30fb54406ea91918774463e6f22e3ac442d584ff20134ea0

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