Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec90c2ba3fb180c…

MALICIOUS

PDF

68.1 KB Created: 2021-03-11 23:02:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c691c2458994bf43bf3c6d4d3bbbe3c SHA-1: b8c6bf4a4813847f010be345c754500131f370d0 SHA-256: aec90c2ba3fb180c6c51f81dae4af7b42471346812a030bf98f4d7f3d2966eb3
184 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and heuristics point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7003

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
  • 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
  • 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://ponafet.ru/award?keyword=advanced+computer+architecture+important+question+pdf
    • http://wosozage.mypressonline.com/fujifilm_instax_mini_8_manual.pdf
    • https://wabezapodila.weebly.com/uploads/1/3/1/4/131437306/5080094.pdf
    • https://cdn.sqhk.co/dedizajo/cyihahd/95888356111.pdf
    • https://romuxejis.weebly.com/uploads/1/3/4/8/134887308/xinuwiwolap.pdf
    • https://cdn.sqhk.co/dafibuxoki/heifX5Z/rotten_to_the_core_meaning_in_arabic.pdf
    • https://xamilugalaw.weebly.com/uploads/1/3/5/3/135325617/topisufo_semasuzoxa_vezobulo.pdf
    • https://belinadojo.weebly.com/uploads/1/3/1/6/131607131/farufadexudedodemuno.pdf
    • http://lugabev.mygamesonline.org/kakarijiwubifemenilazeno.pdf
    • http://napodosawukezob.getenjoyment.net/59286202589.pdf
    • https://zidovularirijap.weebly.com/uploads/1/3/4/7/134718784/xosoderopixis-wigarupezeba-modifisofolum.pdf
    • https://xoxitugupara.weebly.com/uploads/1/3/1/3/131383959/tasujunesolosoxufa.pdf
    • https://gulekizusivo.weebly.com/uploads/1/3/5/3/135392766/9586349.pdf
    • https://sezibuginodeso.weebly.com/uploads/1/3/4/4/134470526/8382518.pdf
    • https://cdn.sqhk.co/runenuti/iC0ghgg/supermd_md_gen_emulator.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/leteraxewe/95298466522.pdf
    • http://fidikaxano.myartsonline.com/sodopipuzov.pdf
    • http://penanaras.myartsonline.com/ryobi_10_amp_7-1_4-inch_mitre_saw_canada.pdf
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_bd1349174d5443f69e9f77c17e5f303d.pdf?index=true
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_d75f985457dc41b1ac3a5fbd88de9184.pdf?index=true
    • https://s3.amazonaws.com/nitatotol/sisabibidupagebitebup.pdf
    • https://s3.amazonaws.com/polojuliragam/fiwoxago.pdf
    • https://s3.amazonaws.com/kizugokofo/zowuzexujazemi.pdf
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_45cc1555c40942c99e133b4c18b40b3f.pdf?index=true
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_cc269ca5d1cc4f6da400470bc0ab3467.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee6d.bin
10728f10428beccfdd9c69ec661141662a0dc1eb9223ba714f0c3381e1f37353		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6D 5536 bytes

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