Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e169271b12dd7b…

MALICIOUS

PDF

70.4 KB Created: 2021-09-23 18:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a310296547d589a9974aadcd4220ed89 SHA-1: 1619ad2a93d3e7bb46cc44085157b0fe05ab20e1 SHA-256: a2e169271b12dd7b1b0b83bc339ce3c6e04c46952ac6da0f17b895839f410a04
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains numerous external URLs. The PDF structure and embedded URIs suggest it functions as a link farm, directing users to various external sites. The presence of multiple distinct hosts and UTM parameters indicates a potential phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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://nomylo.ru/uplcv?utm_term=basic+android+programs+for+beginners PDF link annotation
    • https://accesoriosalmayor.com/images/userfiles/file/lenavuwolekodelujat.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/30315818494.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/88851203295.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210922051019.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/f029fed93eb7d86867f3ea2da8578ddb/74172369989.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/10346461734.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/42614249058.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/pusojokiriwopixoxekugo.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161421890388e0---mumagakemib.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/kizawemelotimojori.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/68801100452.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/daferotaweziz.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/kalewomatefojojomukev.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/nusibibex.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/87817431402.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/4918138253.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/sadatixuwowufafugikegi.pdfIn PDF document text
    • https://salwangurugram.com/files/jesupabe.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/widami.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/vikujataximikajuj.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://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_off0000b35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35C 15616 bytes
SHA-256: accc4c6187b223234e1354e299b4de849f259abf9f2b1f5bffb9bc8af4e75107
font_01_sfnt_off0000db0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0A 11012 bytes
SHA-256: d8402c2ed1ffe67ef1cf3355d2b11027730bf0c7dc28d03ac3705889ff46b060
font_02_sfnt_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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