Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e694fe7d004429a…

MALICIOUS

PDF

87.2 KB Created: 2021-04-25 13:40:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2541f03ed1a244f717d2afcff77ae412 SHA-1: 97f684031bcaa38aaf5fa0e38475b89121fbd427 SHA-256: 6e694fe7d004429abbc945f8eb898ffc0b40db10897cc41c6096255b9980ade5
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains numerous external links, with the primary suspicious URL being 'https://zajinet.ru/strik?utm_term=asus+p9x79+le+usb+bios+flashback'. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malicious content distribution scheme, possibly leveraging SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://zajinet.ru/strik?utm_term=asus+p9x79+le+usb+bios+flashback
    • https://povemiloten.weebly.com/uploads/1/3/4/6/134608376/mizaxavilurot.pdf
    • https://muxetomanudone.weebly.com/uploads/1/3/1/4/131406273/muvevozuxuw.pdf
    • https://mufisifarugevap.weebly.com/uploads/1/3/4/5/134595961/jorogolij.pdf
    • https://xigogedamexov.weebly.com/uploads/1/3/1/3/131384098/lipavox_fetefum_kazinerodirado_sapiz.pdf
    • http://gatofupimekow.mywebcommunity.org/school_bus_coloring_page.pdf
    • http://vozobatenaw.mywebcommunity.org/beating_the_street_peter_lynch.pdf
    • https://subokolabipu.weebly.com/uploads/1/3/2/3/132303028/2298248.pdf
    • https://tokafiwunan.weebly.com/uploads/1/3/4/3/134372509/3b63484acd82d.pdf
    • http://kobodesuwid.getenjoyment.net/98506538567.pdf
    • https://resodarapasak.weebly.com/uploads/1/3/4/6/134659305/jemasenar.pdf
    • https://gikotibosad.weebly.com/uploads/1/3/4/3/134332820/7dd7a533.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kexamoxusinixu/susujaje.pdf
    • https://s3.amazonaws.com/vovopafubipu/95901493061.pdf
    • https://s3.amazonaws.com/fivebo/sheet_nhc_gp_m_trong_m_piano.pdf
    • https://s3.amazonaws.com/kaxukok/cours_d_algorithme_et_programmation.pdf
    • https://s3.amazonaws.com/feliso/bitter_bold_font.pdf
    • https://s3.amazonaws.com/xixonu/47134351567.pdf
    • https://s3.amazonaws.com/wolina/a_critical_introduction_to_the_study_of_religion.pdf
    • https://s3.amazonaws.com/jinotugiwomo/11840261281.pdf
    • https://s3.amazonaws.com/jolituzoji/dirulatibekarejiduxad.pdf
    • https://s3.amazonaws.com/nowonovege/vagemifiji.pdf
    • https://s3.amazonaws.com/popisiburewixuj/brown_eyes_already_one_year.pdf
    • https://s3.amazonaws.com/patotale/30792504.pdf
    • https://s3.amazonaws.com/wakuzidi/how_often_to_clean_furnace_flame_sensor.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_off0000ef5e.bin
0f9bb05ef09aa247d47f5272753410a8e263d26ce24ec10e82c4bd95333870b0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5E 9152 bytes
font_01_sfnt_off00010e2c.bin
ab695904a82db5e140b2af3207c8ea8111488e7d2470b5c25d0b4bf6a80ac23c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2C 5504 bytes
font_02_sfnt_off000120ed.bin
c2f837536e009110836555bce90837f721b8264964118a75fb28a64f8884cbc6
pdf-font-stream PDF embedded font (sfnt) at offset 0x120ED 15564 bytes