Malicious PDF — malware analysis report

Static analysis result for SHA-256 c820990f8ee7e77b…

MALICIOUS

PDF

97.0 KB Created: 2021-04-01 00:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 446addf4cdf3f913c78c15e815b85a6c SHA-1: 2a61dec5388685a3d1ab1a95f7f35f336ae60bf4 SHA-256: c820990f8ee7e77bd09cce296bb0a258933408b9ff0afe7b01a417fe3baf63ce
134 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains text related to downloading a PDF, and embedded URLs point to domains that are likely part of a link farm or hosting malicious content. The presence of external URIs and the overall structure suggest an attempt to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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://bologen.ru/award?keyword=alan+moore+from+hell+pdf+download PDF link annotation
    • https://tonuvufew.weebly.com/uploads/1/3/1/4/131438708/zorixovet-wazamobawokabid-gofidep-rulawasinidudu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453888/normal_605538732c981.pdfIn PDF document text
    • https://xaxibilezulaf.weebly.com/uploads/1/3/4/0/134096047/7df3e83b5acb8ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365639/normal_5fefa817148d4.pdfIn PDF document text
    • https://rudofodirofebas.weebly.com/uploads/1/3/0/7/130739781/bd001.pdfIn PDF document text
    • http://4kuhd.me/gavozogefawenasanerunnuguy.pdfIn PDF document text
    • https://vejupurujiku.weebly.com/uploads/1/3/1/6/131606174/441869.pdfIn PDF document text
    • https://namobilezivi.weebly.com/uploads/1/3/1/8/131857476/zegizovogam-sasuboposunitat-sunusixaz.pdfIn PDF document text
    • http://aduo5.online/how_many_views_to_make_money_on_youtube_reddit0z0xz.pdfIn PDF document text
    • http://tusuvopub.22web.org/38331372049.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409840/normal_603178bb2e7f7.pdfIn PDF document text
    • http://vilopeg.xyz/nfs_most_wanted_android_12jl0y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410679/normal_6008a648288f6.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://buxusemi.epizy.com/jilejusabaxatemigazilen.pdfIn PDF document text
    • http://zititerawori.epizy.com/banorte_movil_app_android.pdfIn PDF document text
    • http://dibijix.rf.gd/witixigasilasifej.pdfIn PDF document text
    • http://sobuzazan.rf.gd/lenovo_yoga_500_battery_not_charging.pdfIn PDF document text
    • http://kesufelitam.rf.gd/vanewimolonijuw.pdfIn PDF document text
    • http://kotokadi.rf.gd/vadunu.pdfIn PDF document text
    • http://fuzezufomazo.rf.gd/guided_access_app_unavailable_iphone_intune.pdfIn PDF document text
    • http://jobifizokugo.rf.gd/zibategafizajufewul.pdfIn PDF document text
    • http://ruzuzis.rf.gd/76636683951.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_off000126fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FA 4844 bytes
SHA-256: 58665a44e4ad1e6bc2b296aecf402538b49edee256c6462b66d6aac82cc0b679
font_01_sfnt_off00013744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13744 15124 bytes
SHA-256: 269aaa120d2d22d38a83b70878559f53868dc132a1fa85630ce467db54376bd9
font_02_sfnt_off000166bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166BF 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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