Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3b407d0a607438…

MALICIOUS

PDF

78.1 KB Created: 2021-03-13 19:21:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0089d220650ead09f701c01447d1fefb SHA-1: 9b5341443bcd5872cbd10994eaaedb50091ddce3 SHA-256: 3c3b407d0a607438fcfb2bdfbf5277a156992774dc1aff7d8efc6bf386a830d3
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 0.9992

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 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/123?utm_term=macpherson+report+sociology PDF link annotation
    • http://jsexj.fun/81001857864l559r.pdfIn PDF document text
    • https://rominekajamarol.weebly.com/uploads/1/3/4/0/134040464/f3cc66fe.pdfIn PDF document text
    • https://jiresuzava.weebly.com/uploads/1/3/4/7/134706808/107a79e5b922.pdfIn PDF document text
    • https://sixapinipuso.weebly.com/uploads/1/3/1/3/131384402/561f1b5a7e8ec0.pdfIn PDF document text
    • https://rerofijujujedo.weebly.com/uploads/1/3/1/8/131872137/tibebovafanifulumalu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500692/normal_600513c723b18.pdfIn PDF document text
    • https://viwifigejemi.weebly.com/uploads/1/3/0/8/130814408/b517c.pdfIn PDF document text
    • http://lnstagram-helping-centre.com/867545039090mod1.pdfIn PDF document text
    • https://zebepinexorusog.weebly.com/uploads/1/3/2/6/132695607/fifupob.pdfIn PDF document text
    • https://xikidofivikoru.weebly.com/uploads/1/3/0/7/130776888/47f14b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451352/normal_60164b9d96b18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416810/normal_6035a7151a48f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461481/normal_600013ad5a359.pdfIn PDF document text
    • https://gixisisopovi.weebly.com/uploads/1/3/4/7/134713576/kunutezipebe-vewodofaterid.pdfIn PDF document text
    • https://vitovoraf.weebly.com/uploads/1/3/1/1/131164311/a0dee65.pdfIn PDF document text
    • http://texno3ua.com/encoding_and_decoding_matrices_worksheet4xp38.pdfIn PDF document text
    • https://dosedupuwosiwoz.weebly.com/uploads/1/3/0/7/130776272/98883.pdfIn PDF document text
    • http://wtia.space/72066198976ed5mw.pdfIn PDF document text
    • https://gumelajijepepa.weebly.com/uploads/1/3/4/6/134639918/givudi-veluwesofi.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/genukopapovixo/telecharger_bordereau_de_paiement_cnss_maroc.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/bajovexomotubawegoz.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/xelinagumopumej.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/kekegopifis.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/guess_the_brand_app_cheats.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_off0000f29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29D 5300 bytes
SHA-256: c5fea05d952862ec70d6ab1f5c9fa87ac10a72dba268f1aeb2bba4b85fc76e4d
font_01_sfnt_off000104b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B2 10800 bytes
SHA-256: 6bd0adf7ce6dda9c491cb10c85740aa9593382bcbac2f3a4ea7c047bb395dec1

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