Malicious PDF — malware analysis report

Static analysis result for SHA-256 71810fc3bd3ad8b0…

MALICIOUS

PDF

77.2 KB Created: 2021-05-15 05:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a538450ec5ffb86f84313fc4c186b88b SHA-1: 1c64bdb5d3c6c2b869ea798c0ccffa29a08edf5f SHA-256: 71810fc3bd3ad8b0cba1da9c4aed906d8d72bd74f17ea73c415eeb26eb56a8d9
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://botokaw.ru/strik?utm_term=how+many+questions+on+permit+test+va', appears to be a lure, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan distribution.

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://botokaw.ru/strik?utm_term=how+many+questions+on+permit+test+va
    • https://cdn.sqhk.co/mudaxomemut/ihictZb/burger_time_menu_fargo.pdf
    • https://sezebotari.weebly.com/uploads/1/3/1/6/131636698/4970465.pdf
    • https://cdn.sqhk.co/figotabam/7ibghhh/jagigoz.pdf
    • https://nozesebekujizaj.weebly.com/uploads/1/3/4/6/134698307/e3c02c.pdf
    • https://cdn.sqhk.co/zotofoza/jahjjey/fawigufexebumezobasi.pdf
    • https://cdn.sqhk.co/letarezetap/PibLjcP/clothes_worksheets_clipart.pdf
    • https://cdn.sqhk.co/makubeku/6icvRGc/benamedokokamet.pdf
    • https://vipozuguru.weebly.com/uploads/1/3/1/4/131483083/6157992.pdf
    • https://cdn.sqhk.co/dodamewope/jXSMicl/purowo.pdf
    • https://zolotamazuragif.weebly.com/uploads/1/3/2/7/132712333/nosuko_laromuzanajowas_govakul_fedezunevu.pdf
    • https://cdn.sqhk.co/kizafizutuw/eghhLuR/ice_cream_sandwich_near_me.pdf
    • https://cdn.sqhk.co/mugukawi/ddggQhg/wordpress_login_page_redirect_loop.pdf
    • https://mugejonisisekof.weebly.com/uploads/1/3/1/4/131437633/bituwi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kudowo/69296752678.pdf
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_0cb1849e84504083b41b74ab6ed57275.pdf?index=true
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_2217a14ae39941ae9ed8b6cab53814b5.pdf?index=true
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_38124ed352d2416cbfa5d67d8d96e9fb.pdf?index=true
    • https://s3.amazonaws.com/vovuzize/95827227309.pdf
    • https://5a98ae10-8c7e-48da-b83f-9bcbc644cfa3.filesusr.com/ugd/9a8764_4c2fa4eb270340f69dc793444942a8ab.pdf?index=true
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_476e3fa36afd4ee5a3ae5a5e0981d935.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_off0000eefd.bin
220e8c2e10d8805a148ee9af31e256b15866fc94272e843bc9e35ac288471a63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFD 5272 bytes
font_01_sfnt_off000100f0.bin
b7bc4cdf38785246d1871f3abc881a17a076f25bd9dd744530e90bdce0f1e698		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100F0 11196 bytes

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