Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbededf956968d77…

MALICIOUS

PDF

72.6 KB Created: 2021-03-09 17:37:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49df50eef78b27dcce2051eebd039771 SHA-1: 21b23aee8fce33b40a5d39c71906a62c631e30cd SHA-256: bbededf956968d776ce0c8f16de6ce25406851db9151c59c9d86a854030171f7
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to a suspicious URL, which is likely intended to trick the user into downloading a payload or visiting a phishing site. The document body, though heavily obfuscated, suggests a lure related to 'conservation of mass worksheet answers'. No scripts were extracted, but the presence of external URIs and the ML detection strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/wix?keyword=conservation+of+mass+worksheet+answers
    • https://static.s123-cdn-static.com/uploads/4402956/normal_600869fd4a3a2.pdf
    • https://cdn-cms.f-static.net/uploads/4471723/normal_601b5bd97da97.pdf
    • https://static.s123-cdn-static.com/uploads/4464871/normal_5fec8ec655ca7.pdf
    • https://seritixatot.weebly.com/uploads/1/3/1/0/131070849/ae7eb7d.pdf
    • https://cdn-cms.f-static.net/uploads/4376120/normal_6037a1bd45b59.pdf
    • https://static.s123-cdn-static.com/uploads/4426814/normal_5ff676a815433.pdf
    • https://sawepaxir.weebly.com/uploads/1/3/1/8/131858353/jelotefigupomox.pdf
    • http://com-servers.online/12010516185bxzp3.pdf
    • https://static.s123-cdn-static.com/uploads/4367633/normal_5fe2eef03d590.pdf
    • http://nesobaka9.xyz/34770996318ke3vq.pdf
    • http://gatorama.fun/how_to_reset_symbol_barcode_scanner54gqv.pdf
    • http://prizinsta.info/plumb27_s_veterinary_drug_handbook_8th_editionp25az.pdf
    • https://kusuxifitumaka.weebly.com/uploads/1/3/4/5/134593182/f6e9bf83773.pdf
    • https://gaxurorilapuw.weebly.com/uploads/1/3/2/3/132302857/kikivovasijevonemifi.pdf
    • https://static.s123-cdn-static.com/uploads/4450421/normal_5fc873efbec81.pdf
    • https://cdn-cms.f-static.net/uploads/4365653/normal_602ac970ebe6b.pdf
    • https://lobogisotu.weebly.com/uploads/1/3/4/8/134870795/rosuxiko.pdf
    • https://dalatomim.weebly.com/uploads/1/3/4/3/134344090/biwojimiturumirijaxi.pdf
    • https://dasaxurakusep.weebly.com/uploads/1/3/4/0/134017902/barul.pdf
    • https://cdn-cms.f-static.net/uploads/4476432/normal_60170f46de239.pdf
    • https://xunedoworevesa.weebly.com/uploads/1/3/1/1/131164322/kajerobolesuli.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/putelekireza/lepadajabagudaxige.pdf
    • https://s3.amazonaws.com/vaxebisapesi/cardiopatia_reumatica_2017.pdf
    • https://s3.amazonaws.com/lekezaru/iron_maiden_dvd_bootlegs.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_off0000dffb.bin
4d5af85ff0ab7882ecd407fffe00df85d3d848895f165743ebfd5d06d994bc2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFB 5096 bytes
font_01_sfnt_off0000f13a.bin
aa3a3071e83db8d977f78919e3763ce0bba75f5884a5304fda8c8f17fced4398		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF13A 10424 bytes

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