Malicious PDF — malware analysis report

Static analysis result for SHA-256 234920f65f77e5e9…

MALICIOUS

PDF

91.6 KB Created: 2021-03-18 21:57:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6201dac91e82968de2a3748163c27002 SHA-1: 1c9d1cb43e75be357532f7dadafc9ea93d977514 SHA-256: 234920f65f77e5e964738835a106f6386c398a642670e3be71535db82980ed52
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to domains associated with link farms and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The primary function appears to be redirecting users to other malicious or spammy content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://druttle.ru/strik?utm_term=science+and+sanity+wikipedia PDF link annotation
    • http://allfreebets.ru/gatotizenopibakumuheup3.pdfIn PDF document text
    • https://pijawofixogut.weebly.com/uploads/1/3/4/0/134017865/6927401.pdfIn PDF document text
    • https://xadijonoru.weebly.com/uploads/1/3/3/9/133997446/vibusazamarug.pdfIn PDF document text
    • http://matras-24.ru/can_you_try_clothes_on_at_old_navy_covidqb1j6.pdfIn PDF document text
    • http://ibkreactiva2020.com/51180077896tm0pv.pdfIn PDF document text
    • https://zukudanasoxe.weebly.com/uploads/1/3/2/8/132815154/fisobox_sodasirofom_forofosopivukel.pdfIn PDF document text
    • https://cdn.sqhk.co/nubavojek/BjiRkcs/fijajugitog.pdfIn PDF document text
    • http://itprod.space/tipewifipavuravumexinuxu2wz.pdfIn PDF document text
    • https://xuzuvakewose.weebly.com/uploads/1/3/1/6/131637797/84002bc5.pdfIn PDF document text
    • https://cdn.sqhk.co/zafupusapun/tjjiAhd/77168974690.pdfIn PDF document text
    • https://fosuwelu.weebly.com/uploads/1/3/2/6/132695698/lamev_wogadolivuki_watupiwumovu_pajasozegixum.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
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_75b266c2dd514ee8b2dd2f6f3d997cfc.pdf?index=trueIn PDF document text
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_06b2167fb3894ec3b6a27959b5046c0f.pdf?index=trueIn 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_off00010daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAF 4976 bytes
SHA-256: 02070b4f1cc226e15346c6423b6bd57a04eb9672546ca32dbd838bcc014f7831
font_01_sfnt_off00011eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBA 22416 bytes
SHA-256: 0ce49391122728ebe83a2c74ed9abd3567c1e88adb7fa99a2842471716dda1a1
font_02_sfnt_off000151de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151DE 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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