Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e495aae2d2b69b4…

MALICIOUS

PDF

88.3 KB Created: 2021-03-16 12:45:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93c548ac7e8bb4bc83c4273eabf0ffe7 SHA-1: 9218a69a1a3be246f6f4a824c92458f46b7f0c6c SHA-256: 4e495aae2d2b69b4f7fac36b7f968526fe0354454df7610472317e0b5b419dc4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a significant number of external links, identified as a PDF SEO link farm, directing users to various PDF files hosted on external services. One of the primary URLs, 'https://soxebez.ru/123?utm_term=gazebo+resort+pattaya%2528+formerly+pattaya+beach', appears to be a malicious lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://soxebez.ru/123?utm_term=gazebo+resort+pattaya%2528+formerly+pattaya+beach
    • https://zawanudodulir.weebly.com/uploads/1/3/1/4/131452903/24061253af7f1.pdf
    • http://gratoram.site/cobra_29_lx_wattagexpn8b.pdf
    • https://zilexewutefak.weebly.com/uploads/1/3/4/6/134608169/suwogilefozejef.pdf
    • http://fakixigulidol.mywebcommunity.org/does_juice_plus_tablets_make_you_lose_weight.pdf
    • http://odebayitrafikhizmeti.com/43804822551tq6ae.pdf
    • http://nupifijaw.getenjoyment.net/tennessee_williams_books.pdf
    • http://bewewafip.scienceontheweb.net/fetaxuba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/muxozuvalubi/xamidaxigubuli.pdf
    • http://vanosojude.epizy.com/que_es_la_anemia_macrocitica.pdf
    • http://tezimekuzezu.epizy.com/king_david_timeline_of_his_life.pdf
    • http://pavinudoj.epizy.com/wukelifagijurejofux.pdf
    • https://s3.amazonaws.com/joterige/university_of_alabama_football_news_bleacher_report.pdf
    • http://xesewopalokix.epizy.com/margaret_atwood_the_testaments.pdf
    • https://s3.amazonaws.com/baxekojojexusol/21161913263.pdf
    • https://s3.amazonaws.com/libosokune/fopavinalokujebuziritefed.pdf
    • http://visunizuze.epizy.com/23054185545.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001027e.bin
61fc79a170f8abbdadd4df70d40db10c64cfbef28111ac2a546b5aa4baa9e411		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1027E 5288 bytes
font_01_sfnt_off00011498.bin
7dabe0314282e9327e03d11be876800a558491daa964bf26082fadd4d500da7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11498 16172 bytes
font_02_sfnt_off00014613.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14613 4324 bytes

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