Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7133c9bbe385ae8…

MALICIOUS

PDF

76.3 KB Created: 2021-06-02 00:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e12d0bc77877ab1c3c8a866c29878175 SHA-1: cba1fa102a222f3e0f9c0e048c036e4955bd7dd2 SHA-256: a7133c9bbe385ae894acd043848feae52eb467c738326424e8a47afbc9785e08
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, which is characteristic of SEO link farms or phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into clicking links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/123?utm_term=comprehensive+report+template PDF link annotation
    • https://junanopawakeza.weebly.com/uploads/1/3/3/9/133999625/e1c0480c.pdfIn PDF document text
    • https://xuwulusepe.weebly.com/uploads/1/3/5/3/135310973/xutagozivifevisijor.pdfIn PDF document text
    • https://pareropifu.weebly.com/uploads/1/3/4/3/134349273/6245286.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446650/normal_6047a40d68e85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453338/normal_606226e90604e.pdfIn PDF document text
    • https://woxavadegiw.weebly.com/uploads/1/3/4/9/134902916/fabunovoni_ramugip_rixidedusideso.pdfIn PDF document text
    • https://fofelopuvamugav.weebly.com/uploads/1/3/4/7/134716477/1187962.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499341/normal_5ff42fdde630b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476567/normal_6066f4e645bc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476924/normal_6028ab17abfc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463794/normal_60402eed8229b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480884/normal_603879d6c053b.pdfIn PDF document text
    • https://gevivefopunuxaf.weebly.com/uploads/1/3/4/3/134331765/xazaxe_fovujinutexaga_zatorovikila_fafatedu.pdfIn PDF document text
    • https://pobipumobixox.weebly.com/uploads/1/3/1/0/131070364/venebovatalirax_nodoxujezirosuw_gamefudatebiriw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472764/normal_6010837f26a5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367617/normal_5fd812cb875a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383302/normal_6051240641d99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450037/normal_5fd7808c47efb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wepoline.pbworks.com/w/file/fetch/144450420/zisodumogorirezazebuda.pdfIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144425295/blockman_go_mod_apk_unlimited_everything_download_latest_version.pdfIn PDF document text
    • http://wiwedano.pbworks.com/f/67978952431.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE229 4932 bytes
SHA-256: 538ef179024cb1c02009cb6917875728dd730836e1c2586eb5591256d4bfb339
font_01_sfnt_off0000f2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BC 10364 bytes
SHA-256: 9e42d6e3133a3f1e92e2741dcd799cfb8d582e4540a4c715c1ca3e0bb45e4f58
font_02_sfnt_off000115f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F2 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333