Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3700338b7155684…

MALICIOUS

PDF

75.6 KB Created: 2021-03-19 19:32:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 102dfb67583d06dd101b9d2a6a3012c4 SHA-1: 4149b234bb262c47fdc1628f52166953e444cf30 SHA-256: c3700338b715568406f23936e1e6bedde8f858b995dbb398194eb34e251839fa
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains a large number of external links, indicating it's part of a link farm designed to drive traffic to other sites. The primary URL suggests a lure related to 'ebooks' or 'effortless English', likely a phishing pretext. While no scripts were explicitly extracted, the PDF structure and extensive external linking are strong indicators of malicious intent, possibly for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/award?keyword=ebook+effortless+english+pdf+full
    • https://wavikifetin.weebly.com/uploads/1/3/4/9/134901048/3bae7e8fd.pdf
    • https://cdn.sqhk.co/delojiwuguj/ejdkieF/honda_gx160_motor_spark_plug.pdf
    • https://pusigigapuguv.weebly.com/uploads/1/3/1/4/131438477/8958912.pdf
    • http://stav-games.ru/kisakughfot1.pdf
    • https://nogojajefe.weebly.com/uploads/1/3/5/3/135314992/1706453.pdf
    • http://generalmassage.online/lulodijakedadifuvetc87p.pdf
    • https://fupakedozoj.weebly.com/uploads/1/3/1/4/131407080/safipazezokopubiloto.pdf
    • https://static.s123-cdn-static.com/uploads/4393346/normal_5feee3e651afc.pdf
    • https://static.s123-cdn-static.com/uploads/4485313/normal_60073a20b3e68.pdf
    • https://cdn.sqhk.co/tiwumixe/8cUXhb9/ginaba.pdf
    • https://cdn-cms.f-static.net/uploads/4374369/normal_6033d04fd572f.pdf
    • https://fijomenameti.weebly.com/uploads/1/3/0/8/130874411/8613ba55a5262.pdf
    • https://cdn-cms.f-static.net/uploads/4451220/normal_6033a08bce81e.pdf
    • https://cdn.sqhk.co/kumipexa/ejgfigX/lenas.pdf
    • https://toxobeveja.weebly.com/uploads/1/3/1/4/131437160/lipuxetif_zituwevutusa_dukosufakaja_fafudabev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dd39d194-9042-494f-90ab-223c96cf8da5.filesusr.com/ugd/5d3909_380ce71023e54aba9c18620809891ffa.pdf?index=true
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_e146b35dd9574b969d5caa60e693d62d.pdf?index=true
    • https://6323cc82-cf72-43ae-bc7a-f8d691a1d37e.filesusr.com/ugd/4f3578_50352de240634fbb8ace89d5d37fe21d.pdf?index=true
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_47fadb5ae61545bea56a3dfb319cdf77.pdf?index=true
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9c1.bin
c1a095ac01e86bd5012fbf38a851c04956aacc38eb824bf32f1ba38a93c1825c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C1 5256 bytes
font_01_sfnt_off0000fb9e.bin
587d26584878136f25921b5d2dfc521cec97a418ab46da8a549637904221cd83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9E 11052 bytes

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