Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b9055b29082214…

MALICIOUS

PDF

86.1 KB Created: 2021-02-15 12:06:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f55d3910fcd159c029acb533a66f6b72 SHA-1: deb6affcf1fa0a3bd4a2938c3b1f790079515695 SHA-256: 42b9055b290822145ff368a42dc15ff24f03104925004b796e3ddc4853b4f406
156 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 5

  • 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.
  • 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://jottigo.ru/strik?utm_term=easy+piano+music+books PDF link annotation
    • http://testvvd.xyz/guidesman_flashlight_1000_lumensk5k1j.pdfIn PDF document text
    • https://nosobafib.weebly.com/uploads/1/3/1/4/131438228/3149966.pdfIn PDF document text
    • http://zofanelo.22web.org/fiman.pdfIn PDF document text
    • http://mosasekoz.22web.org/97367455338.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479441/normal_5fda72cbd2fd4.pdfIn PDF document text
    • https://sakotitalivuvu.weebly.com/uploads/1/3/4/8/134887700/buwijutozijow-sikewi-bulug-fejap.pdfIn PDF document text
    • https://posajegodat.weebly.com/uploads/1/3/4/4/134477503/zunedazinasa_wajitepomo_jojuxan.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/lakadutof/25757409268.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/best_video_maker_android_app.pdfIn PDF document text
    • http://kozatoreke.rf.gd/xanaxil.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/printable_banner_letters_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/3584214381.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/72432683322.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDD 5216 bytes
SHA-256: eefc530f22026bd32e127c2df1378ba36b4fd3c33dfaf88f4aed6569d95112d9
font_01_sfnt_off00011097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11097 11320 bytes
SHA-256: 1719146141074ae1823253232a85ce5824da8846a12ca382fc4b51c15dd5b5ed
font_02_sfnt_off000136e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E6 16100 bytes
SHA-256: 9cfb948b915a4694feeb7f8719f2b65905b0a58e2ed918074a610570d07e7249

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