Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7a6bbeadcfaacd…

MALICIOUS

PDF

89.6 KB Created: 2021-04-07 03:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a8f9fab0214572af8dcbdcb843ceff7e SHA-1: dd1a536db8700741dcd06b921d3e33b5465f2c60 SHA-256: 8c7a6bbeadcfaacdcf6c469b765ea1e03c464ef4a04c5494b126f24d7a2199f0
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are to suspicious domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution lure, likely using a game as a pretext.

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://kuzutuzo.ru/123?utm_term=monster+bike+racing+game PDF link annotation
    • https://wedutigumufezeb.weebly.com/uploads/1/3/4/6/134659425/6789991.pdfIn PDF document text
    • http://sy0n.icu/41704806865fw3yd.pdfIn PDF document text
    • http://eushopvmn.site/povijifakorprwp4.pdfIn PDF document text
    • https://sofeparevik.weebly.com/uploads/1/3/4/5/134517226/9469fd09a.pdfIn PDF document text
    • https://namunoxup.weebly.com/uploads/1/3/5/3/135339392/b3224e47.pdfIn PDF document text
    • https://tipurovus.weebly.com/uploads/1/3/2/7/132741110/gevojegukizedu_komexibaxuna.pdfIn PDF document text
    • http://ruluzuzadol.mypressonline.com/types_of_expenses_in_accounting.pdfIn PDF document text
    • http://nonowun.mywebcommunity.org/biology_dictionary_in_telugu.pdfIn PDF document text
    • https://wimaxexuxiwob.weebly.com/uploads/1/3/0/8/130874544/fodowiveb-niwabal.pdfIn PDF document text
    • https://pifabesi.weebly.com/uploads/1/3/5/9/135958575/fitumavuxit.pdfIn PDF document text
    • https://wipemaxo.weebly.com/uploads/1/3/5/3/135345075/zonado-xetuzugamewufi.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/furunumaroxun/surah_mulk_english_transliteration.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/76476342330.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/star_wars_the_high_republic_announcement_trailer.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/15498749611.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/48904357262.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/el_libro_principito_en_ingles.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/sharp_lc-55ub30u_screen_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/jimasosijirufajomutide.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_off00012109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12109 5296 bytes
SHA-256: e0f93882c0f7b829762b47ebbf91de770ac83dcb20e35d48f540deb980661cf1
font_01_sfnt_off00013308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13308 11164 bytes
SHA-256: 74447aff522874eb9109c6b3514c1fb22d91dec2e00b778e94b49e2e7ec94e6e

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