Malicious PDF — malware analysis report

Static analysis result for SHA-256 e397c3a14a992c80…

MALICIOUS

PDF

79.0 KB Created: 2021-06-06 05:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 41f4b5b4e6fac0d8a6716dcd8265d045 SHA-1: b8dcf82869c3e4d3916f9bea1aa5bcb521fdcdcb SHA-256: e397c3a14a992c8043b3bb89836df7a741943de81516e5774b41a1331b6984bf
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded document body, though heavily obfuscated, contains text related to downloading software, and the primary URL points to a site that appears to be a redirector for software downloads. The presence of numerous external links indicates an attempt to direct the user to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://medvor.ru/pbw?utm_term=descargar+neo+geo+full+para+pc+1+link PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451356/normal_601226047531c.pdfIn PDF document text
    • https://xojutezakiveze.weebly.com/uploads/1/3/5/3/135318362/sevudukumexepeg-kegakazazevuwik-vomemafefe.pdfIn PDF document text
    • https://xukaxibuban.weebly.com/uploads/1/3/4/7/134701669/07e2b2ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391335/normal_601cc43219df2.pdfIn PDF document text
    • https://mokabeninenaji.weebly.com/uploads/1/3/4/0/134013120/mobebajigixufe-kobal-bipubafu.pdfIn PDF document text
    • https://tedovuja.weebly.com/uploads/1/3/4/4/134465286/5410192.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491926/normal_602f017bcdd6e.pdfIn PDF document text
    • https://xesisezedowajax.weebly.com/uploads/1/3/4/7/134729639/zedatekuxadedogorub.pdfIn PDF document text
    • https://bejokezogakuji.weebly.com/uploads/1/3/2/6/132695802/f70b1324d.pdfIn PDF document text
    • https://lerorenoj.weebly.com/uploads/1/3/5/3/135390996/muzutazupevokoloneb.pdfIn PDF document text
    • https://gizafagubezuz.weebly.com/uploads/1/3/5/3/135321184/bojatoke.pdfIn PDF document text
    • https://fedubipogumuwu.weebly.com/uploads/1/3/1/3/131379546/tifavofat_doger.pdfIn PDF document text
    • https://fetesebi.weebly.com/uploads/1/3/4/8/134896421/zajusivama.pdfIn PDF document text
    • https://pezobarifad.weebly.com/uploads/1/3/5/3/135394950/daminozibolok-nogupimevufozo-sizuvisimaje.pdfIn PDF document text
    • https://pufemomanuxisi.weebly.com/uploads/1/3/4/3/134344256/bcb444.pdfIn PDF document text
    • https://lukimozogu.weebly.com/uploads/1/3/4/6/134638062/vorisolabigeketa.pdfIn PDF document text
    • https://zixavuxo.weebly.com/uploads/1/3/1/3/131398386/pibizo_wabebavuze.pdfIn PDF document text
    • https://jebilazi.weebly.com/uploads/1/3/1/8/131856389/6375965.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c9c94f4-cb51-45f5-b484-029971850303/flowers_in_the_attic_movie_sequels_in_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d68ed43-12f6-4476-9cdb-82a28bdb14be/illusions_richard_bach_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84709de3-176b-4efb-b0d9-f9c6e13ac9be/1679000874.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a834a951-16b9-4247-8474-085f304c97a0/engineering_drawing_software_download_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06aec5d1-f83f-4d77-8176-6ab55b8f1826/filme_online_2020_subtitrate_in_romana_gratis_hd_divx.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_off0000e8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EC 5300 bytes
SHA-256: e545af92aee3a437a373756858673e7c225d6130cb86ea9da0216578f975fafb
font_01_sfnt_off0000fb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB11 2904 bytes
SHA-256: 9ee7db78a680e954fc83827cb3b0ef6d483254f0c29ad6cde1ee3630ce45ecab
font_02_sfnt_off00010704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10704 12180 bytes
SHA-256: e540783479ac11d14480b8c7508a4a6005a586d3fd9269ae7e863aa9c8470404

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