Malicious PDF — malware analysis report

Static analysis result for SHA-256 026bca0918e85c2c…

MALICIOUS

PDF

68.7 KB Created: 2021-03-28 02:41:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d3d985a827779e0c74d0231e1171d6b SHA-1: 92752b695ddb686b1708122dded01e014e5d94c7 SHA-256: 026bca0918e85c2cceb570cf3f9b11e0584c17865790898be6ad89cbb2c48ac0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which are likely part of a link farm designed to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs suggest the document is used to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=10+day+green+smoothie+challenge+recipes
    • http://alsamcctv.com/suffixes_worksheet_grade_4bgguz.pdf
    • https://kedosesu.weebly.com/uploads/1/3/4/8/134853013/7974547.pdf
    • https://woxogobigevi.weebly.com/uploads/1/3/0/8/130814596/ladolobuk.pdf
    • http://mx50off.pro/84369240978vvnxg.pdf
    • https://xapukaxefibaj.weebly.com/uploads/1/3/4/7/134772468/2392884.pdf
    • https://nasijominazol.weebly.com/uploads/1/3/4/3/134366940/9050646.pdf
    • http://krokoboko3.xyz/574190164725iv24.pdf
    • https://nuwusiran.weebly.com/uploads/1/3/5/3/135321198/9564799.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/niporofez/natosanezosafatatemar.pdf
    • https://s3.amazonaws.com/zoromexemuzid/zolusadepuwasasofenemuju.pdf
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_04eefc674e2a40a591611801a011bbcf.pdf?index=true
    • https://86f5e18a-8766-4ae7-b9bf-31430b627380.filesusr.com/ugd/911c12_a7efc79024974319a226662f1b266d17.pdf?index=true
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_9061d8b2f19a4a72a5ab86bc605d65fb.pdf?index=true
    • https://s3.amazonaws.com/pobixedele/31747485149.pdf
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_0ad958badcc34e17af2f0ef3bf9006d6.pdf?index=true
    • https://s3.amazonaws.com/rujabepifar/able_resume_templates_word_2018.pdf
    • https://s3.amazonaws.com/bupijila/81863962132.pdf
    • https://s3.amazonaws.com/xufaxoferugod/funusivufemif.pdf
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_fa5e8f1a8dc54f209ad1d43c757ee053.pdf?index=true
    • https://s3.amazonaws.com/lekizopiloref/87643940651.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfde.bin
2a33f8ab227b760e473af049fd98466f91ac6c6d16ef36e89b89ad207bf84bd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDE 5688 bytes
font_01_sfnt_off0000e31f.bin
c4c94bf9c6814eb8ace520e058236cd25edf4b0e14fabc0b7cded8cf0b353913		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE31F 10108 bytes

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