Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9b38c57ea01d40…

MALICIOUS

PDF

111.4 KB Created: 2021-04-01 20:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07c1e50dd750350e21cd503b93fd7a74 SHA-1: 056732732d4cce03b1384e0ac19f4704fb2d9ab3 SHA-256: dc9b38c57ea01d40fdf0e4c15923d05e29538b83a6ada2c72c7593e2b49c2581
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, 'https://yafferge.ru/award?keyword=meiosis+cell+division+pdf', which is a strong indicator of a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/award?keyword=meiosis+cell+division+pdf
    • http://im-marceting.site/aviary_old_versionsg6p8.pdf
    • http://lekoxaxe.22web.org/wimuzarenemoxu.pdf
    • https://dawawasokiju.weebly.com/uploads/1/3/1/4/131408838/496846.pdf
    • https://cdn.sqhk.co/torujazelome/jaYLtid/kaiser_urgent_care_near_me.pdf
    • https://cdn.sqhk.co/salefudodid/YzwRqUs/xusedemi.pdf
    • http://lakenamazaga.iblogger.org/xuvasip.pdf
    • https://bojifigo.weebly.com/uploads/1/3/4/8/134847606/6183322.pdf
    • https://cdn.sqhk.co/bugolajoxodu/eAjaidG/23700920625.pdf
    • http://wexypay.icu/gutemujf2f4x.pdf
    • https://sigajijatikad.weebly.com/uploads/1/3/1/3/131379485/biduvebimajetob-naligevofiku-xodaw-gusewodef.pdf
    • http://vekisonoloze.sportsontheweb.net/87464955078.pdf
    • http://vibolofisef.mywebcommunity.org/clinical_nutrition_and_dietetics_books.pdf
    • http://srakan.space/windows_7_activation_bypassku9p2.pdf
    • https://kotutoxegaru.weebly.com/uploads/1/3/2/6/132695780/bigobowakobi.pdf
    • https://cdn.sqhk.co/tulotunofuz/Ugcj2ge/37219102986.pdf
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/jedalomuvi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nanaxaj.rf.gd/dog_barking_wav_free.pdf
    • http://xogijowag.onlinewebshop.net/56597270283.pdf
    • http://gibubijoluri.rf.gd/53400072334.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016108.bin
70c4b793e2d02a2495238e2c46b05339d012bb26584537db5f831e8990560d87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16108 4908 bytes
font_01_sfnt_off000171ec.bin
0a245cfdc5fc13656e3a3d964a8ca97f7524e88ea42d26dae2a7bc857405f444		 pdf-font-stream PDF embedded font (sfnt) at offset 0x171EC 11848 bytes
font_02_sfnt_off00019a47.bin
43dd7310e986e37c0562d6efd2a67b6291a0d41fa892ecd43b306c3e7231f7b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19A47 16148 bytes

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