Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f1dae290e9c867…

MALICIOUS

PDF

87.7 KB Created: 2021-03-22 00:58:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c852c0190f6f6abecba995d3995725b1 SHA-1: 7dc4533c5df9cc69899586d6c2b0813bff9ef6af SHA-256: 20f1dae290e9c867bfca62c8c45c6c6dd165b72a21aa2cfd6a5c2f06d8ddec0f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly subdomains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/award?keyword=boiler+mountings+and+accessories+pdf+nptel
    • https://webijizili.weebly.com/uploads/1/3/4/6/134609257/kuminuta.pdf
    • https://pulolated.weebly.com/uploads/1/3/0/7/130740140/4778176.pdf
    • https://wamabiror.weebly.com/uploads/1/3/1/1/131163705/jafavuzojitis.pdf
    • https://feronodi.weebly.com/uploads/1/3/0/8/130813799/ninodidosa.pdf
    • http://wexuxeretul.22web.org/21996467713.pdf
    • http://psylath.com/rajewaxedobonalafuresubrxpnz.pdf
    • http://dfahsdfgjsfg.online/berthold_formata_font_free1jc20.pdf
    • https://wepusetu.weebly.com/uploads/1/3/2/6/132695333/kegonawoda-xezimefusi.pdf
    • http://megalit-korolev.ru/papizeb3i2zt.pdf
    • http://ndfnasg.xyz/85177702826v57ks.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wefadep/carousel_android_developer.pdf
    • http://sazojojuw.rf.gd/puvovanimosazim.pdf
    • http://jixumuvaba.epizy.com/dapiwevok.pdf
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_c7d61da203644a8f9f4a4f1ecc5823ca.pdf?index=true
    • https://s3.amazonaws.com/nedijowewoded/97727410076.pdf
    • https://s3.amazonaws.com/vavabi/16073411672.pdf
    • https://s3.amazonaws.com/tutapaxi/traductor_de_espaol_a_ingles_americano_con_audio.pdf
    • https://b595a6f9-6bcb-48d8-acfc-7cb8c696cf55.filesusr.com/ugd/21f311_0b8f14868b574ae09d192fbd0e52914e.pdf?index=true
    • https://s3.amazonaws.com/jebupofedijakuk/2120410388.pdf
    • https://s3.amazonaws.com/patotale/gaming_intro_template_after_effects.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ae0.bin
40847bef8961be0cf1d956182442c8cea3d96d698a86464e39e13fc1cbf5b8f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE0 5404 bytes
font_01_sfnt_off00011d27.bin
3e8cc184b098718b68dee2108e4206a28ff5b16a861ff81e191842eb28522c05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D27 11228 bytes
font_02_sfnt_off00014306.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14306 4324 bytes

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