Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c461b4996a98710…

MALICIOUS

PDF

77.4 KB Created: 2021-06-13 05:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 588749441e9db3746613458908095492 SHA-1: aafa471ad7ef31fe0ed1532f9f3d7081b9b3076b SHA-256: 7c461b4996a9871087cedfe76e30fc85be6e17efee44931c4f202cd15936a05c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://laborke.ru/pbw?utm_term=third+edition+solutions+upper+intermediate+workbook+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408479/normal_604f6f0f82c3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388183/normal_5fdb55f0b5327.pdfIn PDF document text
    • https://ketibavobatuver.weebly.com/uploads/1/3/4/8/134849788/wejagineguzi_nifezupaloxude_mojigunag_sivawesimeku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392872/normal_6022db1e88625.pdfIn PDF document text
    • https://zerebutaravuna.weebly.com/uploads/1/3/5/9/135965874/8e14a96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486045/normal_6023cfb818db2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365583/normal_603136e587ef8.pdfIn PDF document text
    • https://jurulekoteg.weebly.com/uploads/1/3/4/7/134700509/lojirezugivoge.pdfIn PDF document text
    • https://tariroviwobin.weebly.com/uploads/1/3/4/7/134715354/rudinajamud_gizalipip_mamivaxuxu_nukazumulorumi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470685/normal_606b54e477778.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452385/normal_60680139c2346.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378383/normal_600ae96a77d37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447877/normal_60c40e8739a79.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mulasamesi.pbworks.com/w/file/fetch/144592245/8765965447.pdfIn PDF document text
    • http://gaguwufajij.pbworks.com/w/file/fetch/144871854/how_to_reset_waste_ink_pad_counter_for_epson_l3110_appuals.pdfIn PDF document text
    • http://denipugo.pbworks.com/w/file/fetch/144877269/corel_draw_x8_full_version.pdfIn PDF document text
    • http://degomulaxib.pbworks.com/f/traffic_racer_apk_mod_download.pdfIn PDF document text
    • http://milatufed.pbworks.com/f/dead_no_more_the_clone_conspiracy.pdfIn PDF document text
    • http://xavewop.pbworks.com/w/file/fetch/144825543/caractersticas_y_aplicacin_de_la_investigacin_social.pdfIn PDF document text
    • http://fuzugimife.pbworks.com/w/file/fetch/145168200/lesson_6.2_practice_b_geometry_answer_key.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE399 5528 bytes
SHA-256: d0dea8cd3d332ed005e162c9bea76b97bdc983a304952ee064455a266255c2d2
font_01_sfnt_off0000f640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF640 15232 bytes
SHA-256: e0a321b90c46c802027299293d78511a59e79469a018109fce36910314c09f15

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