Malicious PDF — malware analysis report

Static analysis result for SHA-256 210ef181e9ae8347…

MALICIOUS

PDF

70.6 KB Created: 2021-06-02 20:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1ed9d6f3471e29c8e1d74626535f53da SHA-1: 73cd90b66cf1126b17db62e885cdac42b7f650a9 SHA-256: 210ef181e9ae83476d4e5bd7b38e67ec7df445f849ec536a94a19b597a3c31ef
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://drafthe.ru/pbw?utm_term=nee+irukkum+idam+thaan+mp3+cut+song+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408330/normal_604d18f972064.pdfIn PDF document text
    • https://repadugudemi.weebly.com/uploads/1/3/0/9/130969496/gutox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417423/normal_5ffa996d8e4d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450898/normal_5fda6efe1bb2d.pdfIn PDF document text
    • https://likixulojuxe.weebly.com/uploads/1/3/4/3/134386003/8d8820c30d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477658/normal_5fdb93814de44.pdfIn PDF document text
    • https://laderorigeridag.weebly.com/uploads/1/3/4/3/134309938/c17b26631cf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502870/normal_60113b62e2acd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408709/normal_5fef8fc83e32c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382793/normal_603e2ec04f413.pdfIn PDF document text
    • https://jabuvevakeg.weebly.com/uploads/1/3/4/6/134685488/denupexuw_jakizolituvazu_ludeluxitojabox_kudusag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496391/normal_60483f86b0bd2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://refarumiba.pbworks.com/f/download_gta_san_andreas_cleo_mod_android_nougat.pdfIn PDF document text
    • http://dadilotofexi.pbworks.com/w/file/fetch/144505956/five_goals_of_the_criminal_justice_system.pdfIn PDF document text
    • http://jesababa.pbworks.com/w/file/fetch/144414516/97410460685.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/niwonazunubuvifuwemod.pdfIn PDF document text
    • http://viluxese.pbworks.com/f/57930306757.pdfIn PDF document text
    • http://ridelox.pbworks.com/w/file/fetch/144467628/minecraft_apk_unblocked_for_pc_chromebook.pdfIn PDF document text
    • http://papoxuva.pbworks.com/w/file/fetch/144421440/tewanefiremizibapimipa.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_off0000d55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55C 5776 bytes
SHA-256: 773a41000caed580348ef030bc89c7a34a7b101987ad355906ee4f17d76fefcd
font_01_sfnt_off0000e8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EF 10868 bytes
SHA-256: 779bed6bcbcf9068e77ada2d8bc289eb5894cfe4b67b621ae6bb90903388e768

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