Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ff6bb438c9ef4c…

MALICIOUS

PDF

78.9 KB Created: 2021-03-28 07:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e0d1e249fb08151ba227e39449d05c20 SHA-1: 56cc73a4cafa91de69223daa5e951d2bd5583db3 SHA-256: 10ff6bb438c9ef4c9a91fa89356e1e42a86b5a264abd806c1321ece2d7944bf7
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://fokemale.ru/award?keyword=articles+in+english+grammar+with+examples+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388405/normal_600d4707dc7c0.pdfIn PDF document text
    • https://lizuxafemow.weebly.com/uploads/1/3/0/7/130776517/3d6eb8736b.pdfIn PDF document text
    • https://rinafudafize.weebly.com/uploads/1/3/5/2/135293322/5952001.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470833/normal_5fce2ac9a9aa3.pdfIn PDF document text
    • http://finuxezanasa.mygamesonline.org/44023350528.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377678/normal_5ffe1ced231aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369487/normal_5fdb6bbbb64f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407988/normal_5fe8240f47bb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474448/normal_6017be3a90f15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377377/normal_604ed1dfe5650.pdfIn PDF document text
    • http://vixemifojetinag.sportsontheweb.net/jejolovagujasag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413374/normal_6045c37594434.pdfIn PDF document text
    • https://lezafopiga.weebly.com/uploads/1/3/4/6/134628758/dopedipazoxez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383475/normal_601d3d4d486a2.pdfIn PDF document text
    • https://gariwadol.weebly.com/uploads/1/3/1/3/131380788/verisosarod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490250/normal_5feb177f6a4fa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/accuracy_and_precision_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/behen_hogi_teri_movie_filmymeet.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/chronological_cv_template.pdfIn PDF document text
    • http://zajupulavofawi.myartsonline.com/convert_to_word_document_zamzar.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_off0000f7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C2 5716 bytes
SHA-256: 78c12db5c1b7247056c029d3aa66b5e8ea7eb035876558f6a174cd195a72529e
font_01_sfnt_off00010b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B21 10212 bytes
SHA-256: a7c42cad5d6495384281505eb088b0606640fc430e6a604c2c1619bc78f467c5

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