Malicious PDF — malware analysis report

Static analysis result for SHA-256 242cc32faf795613…

MALICIOUS

PDF

75.0 KB Created: 2021-03-15 22:26:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 84cd56423ac7f8d123fa84e24f08e898 SHA-1: c6330f9b903dcb8c738ca86389f5c30b9fdf22dc SHA-256: 242cc32faf7956138f802f632c5b525dfafccb3b1691b4601712b417b956bfdb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicative of a link farm or phishing operation. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. ClamAV also detected it as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains text related to 'funny social studies quotes' which likely serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://mezovuduw.ru/wix?keyword=funny+social+studies+quotes PDF link annotation
    • http://clubstore.pro/somevuwopdvdym.pdfIn PDF document text
    • http://navalny.design/how_to_make_homemade_pizza_dough_with_yeastheeos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405662/normal_5fe40bc92ac2d.pdfIn PDF document text
    • https://cdn.sqhk.co/mazonixun/jgywBic/cfop_f2l_easy.pdfIn PDF document text
    • https://cdn.sqhk.co/zisujidixa/augfhiG/sofunudisu.pdfIn PDF document text
    • https://cdn.sqhk.co/tobepeliv/MLiehe3/cheat_sheet_for_the_voting_booth_nc.pdfIn PDF document text
    • https://cdn.sqhk.co/wakewafo/gclgiif/dark_forest_cat_backstories.pdfIn PDF document text
    • http://siviveko.getenjoyment.net/pazizerixawimigawusexime.pdfIn PDF document text
    • http://moneyindia.site/valoracion_del_recien_nacido_apgar5a8ld.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444092/normal_600dcc25ae9d0.pdfIn PDF document text
    • http://sifisomatexow.sportsontheweb.net/what_are_the_10_naeyc_standards.pdfIn PDF document text
    • http://giftcard-sale.store/nezusek4muqk.pdfIn PDF document text
    • http://nakozek.mypressonline.com/tumaleponuxuda.pdfIn PDF document text
    • http://healthbeauty24.online/convertible_note_term_sheet_explainedfd783.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416939/normal_60436b360cc2b.pdfIn PDF document text
    • http://podcard2020.site/34359124109ulf64.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_e3a7f05507c3432683048ceccb554e6b.pdf?index=trueIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_3aa60aee130d47188f104b20e9b0b678.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E1 5020 bytes
SHA-256: 8637916c4920eec0dcf43d8923e2ba3d5dd4c4ca1f7d02025c95d88cb9482b36
font_01_sfnt_off0000f812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF812 11352 bytes
SHA-256: 47552e1cd588815cb79f5e59e5af3400d0426a967b937df1be37fd0d873cba01

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