Malicious PDF — malware analysis report

Static analysis result for SHA-256 64410687b10ca097…

MALICIOUS

PDF

75.1 KB Created: 2021-03-11 12:29:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce620a48dc0e868016ae44567f68ce90 SHA-1: 11481e7ee7ca9417ec6972576b43462e4fc5cd4a SHA-256: 64410687b10ca097eb18a0e9de9b32450fee7fa2fecf204acc01ecf685aacbc6
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URLs, many hosted on disposable domains, suggesting an attempt to distribute phishing lures or redirect to malware. The heuristic 'PDF_SEO_LINK_FARM' indicates a high volume of links, likely for SEO manipulation or to host various malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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
  • 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://crophysi.ru/123?utm_term=free+audiobook+s+for+ipod
    • http://nexofozupugasi.mywebcommunity.org/dbt_skills_worksheets_free.pdf
    • https://nizakibete.weebly.com/uploads/1/3/4/3/134386075/sexusumudep.pdf
    • https://static.s123-cdn-static.com/uploads/4416792/normal_5fc7c51680e48.pdf
    • https://static.s123-cdn-static.com/uploads/4476285/normal_5fc733bb4ddd4.pdf
    • https://cdn-cms.f-static.net/uploads/4451019/normal_60388357a8112.pdf
    • https://cdn-cms.f-static.net/uploads/4456712/normal_6012503aa9700.pdf
    • https://rovenefewapug.weebly.com/uploads/1/3/0/7/130775308/kokalutijiro-zisegezaj-monipemi-fisasovowade.pdf
    • http://nizavevorupuj.mywebcommunity.org/secret_of_the_ages_robert_collier.pdf
    • https://puzalanenezow.weebly.com/uploads/1/3/4/6/134693659/2642137.pdf
    • https://bomutakarekavag.weebly.com/uploads/1/3/5/3/135330682/5ee9a2.pdf
    • https://jazujopu.weebly.com/uploads/1/3/0/8/130873842/livuxamiruforunivo.pdf
    • https://sumajodezidozi.weebly.com/uploads/1/3/3/9/133997227/xajevevagakow-powaxumikewo-bimazolulami.pdf
    • https://static.s123-cdn-static.com/uploads/4426087/normal_5feb549b00ab0.pdf
    • https://static.s123-cdn-static.com/uploads/4387938/normal_60045d65d1d3a.pdf
    • https://gifenatewa.weebly.com/uploads/1/3/4/4/134480542/1058491.pdf
    • http://jaralet.getenjoyment.net/toyota_camry_se_2018_tires.pdf
    • http://jetinaxisodew.mypressonline.com/whirlpool_cabrio_platinum_washer_error_code_sd.pdf
    • https://cdn-cms.f-static.net/uploads/4379984/normal_60380d5d41871.pdf
    • https://cdn-cms.f-static.net/uploads/4422385/normal_604500685faf2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://eaa62ee9-779c-4a2d-9f50-6c66b019a99c.filesusr.com/ugd/1cc777_ec6b8f3c49df4f87846838f56bd95834.pdf?index=true
    • http://vovojoj.atwebpages.com/200_gramos_de_harina_a_ml.pdf
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_54a3348883d042d78b5a917b68737168.pdf?index=true
    • https://9cc02d22-446e-415d-9686-6e49aadcb3b3.filesusr.com/ugd/aa6a08_5ee7df34eb5e45ca88c7fe52c41f2d38.pdf?index=true
    • https://b1c30c75-ab46-439a-884d-3836ae4b8a49.filesusr.com/ugd/2d1648_4472f9eb1f7a4fcdb55ca2c931e4f370.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_off0000e864.bin
2614af1928940c80aab7260c40e7aac2425e6bf227f30eb38224e10f80a8eb3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE864 5164 bytes
font_01_sfnt_off0000f9fe.bin
ce698b890adcf71f78539a77c3af454ffd308cd029da8e8e11890c58704587a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FE 10868 bytes

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