Malicious PDF — malware analysis report

Static analysis result for SHA-256 59595c38d74aea13…

MALICIOUS

PDF

68.6 KB Created: 2021-03-29 08:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 00e3c7d92361b2aba3f609a7b027d5f8 SHA-1: ec9b023979686e2a7d4414aeabc3e5b96b3b8d8a SHA-256: 59595c38d74aea134eaa5f9f3d61e867fe0427be950cbcd1af4bdda8336720bd
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document, disguised as a chemistry worksheet, contains a significant number of external links pointing to other PDFs hosted on disposable domains. This behavior is indicative of a link farm or SEO manipulation tactic, often used to distribute malicious content or facilitate phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these linked documents.

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://jacksth.ru/wix?keyword=chemistry+unit+7+reaction+equations+worksheet+2+answers PDF link annotation
    • http://taxevidel.medianewsonline.com/33725269658.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383916/normal_5fda862aa4fdf.pdfIn PDF document text
    • https://cdn.sqhk.co/najafizox/njbieyQ/blood_money_film_songs_free.pdfIn PDF document text
    • https://cdn.sqhk.co/vobilurerire/ahhhhoi/6922769987.pdfIn PDF document text
    • https://cdn.sqhk.co/pukikojat/lXiciai/18596584261.pdfIn PDF document text
    • https://gajokazatiduker.weebly.com/uploads/1/3/4/3/134320060/9246151.pdfIn PDF document text
    • https://cdn.sqhk.co/jurugaguvedu/qjdhije/kid_friendly_tv_channels.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/cFvrsJS/wufubupuretorunozi.pdfIn PDF document text
    • https://mirijanonukuzo.weebly.com/uploads/1/3/2/7/132740352/6472912.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392860/normal_60205285cc31e.pdfIn PDF document text
    • https://sujolatako.weebly.com/uploads/1/3/4/6/134624807/wifigopul_fezidorabobexa_degubaduraviz_tefetoraxopegu.pdfIn PDF document text
    • https://cdn.sqhk.co/togodawexu/s5hbhc2/mega_man_6_mobile_download.pdfIn PDF document text
    • http://matawobedopikam.mywebcommunity.org/pediatric_advanced_life_support_provider_manual_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/rOjbgex/take_lessons_live_login.pdfIn PDF document text
    • http://jotitojimo.mygamesonline.org/56208644404.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_71480614fb714416badc2037ccc900f2.pdf?index=trueIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_f12bcb48ef204c66b64d91a3c789f87e.pdf?index=trueIn PDF document text
    • https://184d393c-d2ff-49e5-bbcb-48626b1dbf88.filesusr.com/ugd/49be48_98cf0eb6aa984817b1922705c464a971.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_off0000ce6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6B 5508 bytes
SHA-256: a92550b6a4e92de9d5bc2af5a10e2a3d9b61cff2471b0f9473f3d371ed8c5295
font_01_sfnt_off0000e116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE116 10464 bytes
SHA-256: 4488d7184826bc78f25f332e1aaf9a7fb79c85f480f9617a39ec24f694e438b3

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