Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b6469a8decf4f59…

MALICIOUS

PDF

71.3 KB Created: 2021-02-25 09:22:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 94d39236ed77a8a8c83374cdf26cedb9 SHA-1: 8ea9965e909fe673bcd242fabfddc6b2ff16d80f SHA-256: 3b6469a8decf4f59dcf61d5eb4f6e96a111534c25efca1d33a0b3508a31e0785
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, appears to contain keywords related to a generator, suggesting a lure to a malicious site. The presence of external URIs and link farm heuristics further supports a phishing or malware distribution attempt.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/award?keyword=onan+7500+quiet+diesel+generator+code+33 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408703/normal_600558af3840c.pdfIn PDF document text
    • http://nowukusox.mypressonline.com/linkers_and_loaders_download.pdfIn PDF document text
    • https://rigefenasoje.weebly.com/uploads/1/3/0/7/130776330/5643855.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/xekuli.pdfIn PDF document text
    • http://anarchymedya.com/how_old_is_artemis_fowl_in_the_last_booke651j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444117/normal_5ffef979935d8.pdfIn PDF document text
    • http://ramosek.iblogger.org/novaro_homunculus_leveling_guide.pdfIn PDF document text
    • http://eeuuurrrrr.space/37572379292aiimj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dobuwawag.rf.gd/62119248458.pdfIn PDF document text
    • http://zezatavaveb.epizy.com/99426586787.pdfIn PDF document text
    • http://gipipirerogarul.rf.gd/48175756209.pdfIn PDF document text
    • http://kimejuj.rf.gd/gituxum.pdfIn PDF document text
    • http://vupafigimewex.rf.gd/29643500064.pdfIn PDF document text
    • http://xopezolesuvobut.rf.gd/mabodopoz.pdfIn PDF document text
    • http://kiroxivox.epizy.com/15360345185.pdfIn PDF document text
    • http://wabipoxagapez.rf.gd/mudibotuxawisoz.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_off0000d9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B7 5772 bytes
SHA-256: a56d4d70ebf508899aae9a778ebfe5362507f7f2d30139f96dd41abb605cef3b
font_01_sfnt_off0000ed69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED69 10212 bytes
SHA-256: 33de5a6f9ca2acaeede8f13be78ac45f6e63d9203bbdba875d062339553b0d66

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