Malicious PDF — malware analysis report

Static analysis result for SHA-256 9497011e4a6a2a1b…

MALICIOUS

PDF

86.2 KB Created: 2021-03-18 20:19:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66bd0e0c10fae404bf0dbed956bff355 SHA-1: d165b10e592b57559d308a4483b674829159430f SHA-256: 9497011e4a6a2a1b62fd8c1a54accdbfab7eb9f44e5c264eeb10ae43aa6e18a4
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-hosted PDFs, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

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://jumiwimov.ru/123?utm_term=calculus+3+review+pdf
    • https://xedagiwaki.weebly.com/uploads/1/3/1/8/131856626/57027.pdf
    • https://cdn-cms.f-static.net/uploads/4476758/normal_601d5a60a14cc.pdf
    • https://puxipevabama.weebly.com/uploads/1/3/4/3/134308905/xisat.pdf
    • https://static.s123-cdn-static.com/uploads/4453754/normal_5fde5dec8afb7.pdf
    • https://tovibibuxajewen.weebly.com/uploads/1/3/5/9/135968099/8579715.pdf
    • https://ponefapu.weebly.com/uploads/1/3/1/6/131637257/wibeterutito.pdf
    • https://kenemujawov.weebly.com/uploads/1/3/4/6/134645985/29b0c.pdf
    • https://buvelixajotoneb.weebly.com/uploads/1/3/5/9/135982000/zirupejab.pdf
    • https://zibekasosux.weebly.com/uploads/1/3/4/0/134040395/fc3f1e.pdf
    • http://tekplafond.xyz/nezufemarelulawefenr86z.pdf
    • https://rifivubego.weebly.com/uploads/1/3/1/4/131407021/5fed4e701860fa.pdf
    • https://sazejibapox.weebly.com/uploads/1/3/4/8/134863873/lafekumu.pdf
    • https://talipugetajizan.weebly.com/uploads/1/3/4/8/134862074/rodoj.pdf
    • https://malolikekex.weebly.com/uploads/1/3/4/7/134718462/wapipabiruvi.pdf
    • http://rubeatyshop.xyz/361379641519bpwn.pdf
    • https://static.s123-cdn-static.com/uploads/4420245/normal_5fc83d69789aa.pdf
    • http://starkrobotics.org/facebook_login_messenger8siiy.pdf
    • http://profaudit32.ru/under_a_cruel_star_themesg63xn.pdf
    • http://nazhivy.net/lenovo_t420_ram_upgradeaxwin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_f321c054d0034bda91e7d013fa996c7a.pdf?index=true
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_fe793b8b7e614531bd4fd75033a057a4.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_off000112bf.bin
dbac56868e39e88d5d0c08796a75addfd05bd6dbc0b9cbd0a8831eb17a768ceb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112BF 5372 bytes
font_01_sfnt_off00012521.bin
3ed3bcae46f0892ffa8b63a1e31b041588908dd1be7ed3f0047f968c57af11e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12521 11432 bytes

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