Malicious PDF — malware analysis report

Static analysis result for SHA-256 976b1998f798aedf…

MALICIOUS

PDF

73.8 KB Created: 2021-01-13 16:40:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 4594e38fb435a35d120dbd84f098c7b0 SHA-1: ec1831596c986c1461e91faad9eaba9c91543dec SHA-256: 976b1998f798aedfdffa7aa321f36a96b37c67f52801e5009b00aed6793aa652
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with a critical heuristic identifying a link farm pointing to various PDF files. One of the primary external URIs, 'https://trafffi.ru/aws?utm_term=english+grammar+pdf+2', is suspicious and likely leads to a malicious site. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/aws?utm_term=english+grammar+pdf+2 PDF link annotation
    • https://site-1084368.mozfiles.com/files/1084368/rimizebezarabodigurafa.pdfIn PDF document text
    • https://cdn.sqhk.co/gawukale/jchi0Aa/top_songs_2019_philippines_list.pdfIn PDF document text
    • https://site-1178548.mozfiles.com/files/1178548/pupiralasadomukisin.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/iagejbQ/zoxosisojirojereb.pdfIn PDF document text
    • https://site-1172409.mozfiles.com/files/1172409/fijijil.pdfIn PDF document text
    • https://site-1188419.mozfiles.com/files/1188419/75013509416.pdfIn PDF document text
    • https://gavixidosoxadi.weebly.com/uploads/1/3/0/7/130776067/fimib-bedemaxej-gosilagu.pdfIn PDF document text
    • https://site-1166042.mozfiles.com/files/1166042/the_crowd_gustave_le_bon.pdfIn PDF document text
    • https://site-1173349.mozfiles.com/files/1173349/powerpoint_presentation_about_myself_templates_free.pdfIn PDF document text
    • https://tetobalowuw.weebly.com/uploads/1/3/4/5/134523757/venepixubanur.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/wonumafubij/apache_openoffice_for_macbook_pro.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/azonto_twins_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/kenopowarutoroxule.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/wefabinare.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/gmo_essay.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromisixinolib/dawn_anne_astrology_answers_reviews.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_off0000e1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F1 5544 bytes
SHA-256: 0dfc06eb4020489a8359f7a8842dacf0e7a4c8305581518d3020a5cfd9401b2f
font_01_sfnt_off0000f4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AB 11240 bytes
SHA-256: 0d2b683c3fe811f1037eb19e6b899ca2015ed5a65f966a16f6ce9073e76e80a0

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