Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ba86f2bbbceebb7…

MALICIOUS

PDF

89.2 KB Created: 2021-02-20 03:27:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e2b65b53cc3e2a54d3e600040f0aa825 SHA-1: 10c4a4612a0ed4387c50165f65874527bfa4b3b7 SHA-256: 2ba86f2bbbceebb795c5490a9608ceff20cf65d892243bac47157d1621cc8619
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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/wix?keyword=parallelograms+using+properties+worksheet+answers PDF link annotation
    • https://jepibuko.weebly.com/uploads/1/3/0/7/130739686/623257.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472188/normal_602e54e0b1c5d.pdfIn PDF document text
    • https://nuzoligul.weebly.com/uploads/1/3/3/9/133997434/liwexi-rezigi.pdfIn PDF document text
    • https://cdn.sqhk.co/fesakesovoka/CcEjahi/fakenimadesi.pdfIn PDF document text
    • https://cdn.sqhk.co/repipedifavi/jb8hjhf/paralyzed_veterans_of_america_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/Mjdpp5C/48301050527.pdfIn PDF document text
    • http://nelawetazabuta.66ghz.com/janinopur.pdfIn PDF document text
    • https://cdn.sqhk.co/gufemazibafi/e6hdhiZ/6259852809.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495973/normal_6014bd384caf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390069/normal_6030249f663f7.pdfIn PDF document text
    • https://mokowevabib.weebly.com/uploads/1/3/0/7/130739664/2573797.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475853/normal_600d56b158402.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gesebokumu.epizy.com/walking_program_for_weight_loss.pdfIn PDF document text
    • http://linanimeb.rf.gd/83691293904.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/balanced_forces_worksheet_1_force_diagrams.pdfIn PDF document text
    • http://bikikifuxax.epizy.com/11410438842.pdfIn PDF document text
    • http://vozajaw.rf.gd/lumiworarebitoro.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE0 5392 bytes
SHA-256: 03779fbc987ad7abb1cf576dba1348f79349411ba3ee037384526b858462eb93
font_01_sfnt_off00011d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1D 10692 bytes
SHA-256: edd488df246027a349bbf75f7665312762ba39d177e40cad8ea515fcdd1511c1
font_02_sfnt_off000141f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F7 16072 bytes
SHA-256: 062f8a7185608a18dbd56baf48eb14c791e3c6ea8866a2ddd6a03467109098f1

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