Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb4b01b6d3cbb82c…

MALICIOUS

PDF

69.3 KB Created: 2021-03-09 08:22:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7181bb85a914e73f839979c40b9fbbaa SHA-1: 96de75fe176a36225cb3955084a06b57aacf7b71 SHA-256: cb4b01b6d3cbb82caa4919af09b4de0ab24a810a7dcbe9b139f707299924bb78
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The primary external URI, 'https://soxebez.ru/award?keyword=dicionario+caldas+aulete+pdf', is suspicious and likely leads to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9244

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://soxebez.ru/award?keyword=dicionario+caldas+aulete+pdf
    • https://cdn-cms.f-static.net/uploads/4391909/normal_602080ce0c9e0.pdf
    • https://cdn.sqhk.co/luzigagoguna/KjcOCeS/5920139220.pdf
    • http://mebovedu.getenjoyment.net/admiral_heavy_duty_washer_troubleshooting.pdf
    • https://vobilazi.weebly.com/uploads/1/3/5/3/135300702/bilobiga-rinoz.pdf
    • https://cdn.sqhk.co/vimexuda/iePaiaf/90831005873.pdf
    • https://cdn-cms.f-static.net/uploads/4456686/normal_6015492b2b890.pdf
    • https://cdn-cms.f-static.net/uploads/4481993/normal_6019f0ee4e83d.pdf
    • https://cdn.sqhk.co/ruxuzobisu/ii7Qijj/celestial_sphere_3d_model.pdf
    • https://static.s123-cdn-static.com/uploads/4469834/normal_5ffdc6ec80594.pdf
    • https://resewirebibabap.weebly.com/uploads/1/3/1/3/131379054/3433107.pdf
    • https://badosajag.weebly.com/uploads/1/3/1/4/131407507/xavenewumili_xupufegonijofuj_jubim.pdf
    • http://tusiteguluvora.getenjoyment.net/example_of_a_central_idea_statement.pdf
    • https://gixosakovi.weebly.com/uploads/1/3/4/6/134677645/6061881.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/xutomoxu/43329423063.pdf
    • https://s3.amazonaws.com/megelugik/88884772066.pdf
    • https://s3.amazonaws.com/risisipajole/wovejivoweguted.pdf
    • https://s3.amazonaws.com/jopomodilamego/61083307916.pdf
    • https://s3.amazonaws.com/libeganot/beard_shape_up_template.pdf
    • https://s3.amazonaws.com/nevowimo/david_copperfield_oxford_bookworms.pdf
    • https://s3.amazonaws.com/gurowozenupifi/70253005966.pdf
    • https://s3.amazonaws.com/risalenefazozo/sexirivonaxetojurapasunun.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1d7.bin
1a7ac34202f0d9feccf9c5e03085e6a6e95ceecadb5f978c54311cef540985b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D7 5028 bytes
font_01_sfnt_off0000e2f4.bin
a8ae7510300f6e49520892f7529d6f743f3245e1e0494130e7adcdaae1357d41		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F4 10312 bytes
font_02_sfnt_off00010651.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10651 4324 bytes

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