Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddd5aa86af428984…

MALICIOUS

PDF

75.4 KB Created: 2021-09-22 18:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 555f41d5103e7cf09857ac1176a05cf8 SHA-1: e92aad4c6f92cf6f09f478c0c39ed43203e23381 SHA-256: ddd5aa86af42898466920b1659d5a2113961465b711c7181a73362fc3716b6a6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=oh+what+a+night+1992+full+movie+putlockers PDF link annotation
    • http://ville-dammarie.com/ckfinder/userfiles/files/wamuruviwojavidapof.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/fetibigekotupimunivemij.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/mikud.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/nitukog.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/87956019839.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/sofuvilelowugaguzis.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/79022426979.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/30562598854.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/40899162927.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/zowunevesokejagibotimoli.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/26099686605.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/22259464720.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/darowokibatimilibi.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210913073017197440045.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/57446262443.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/xozojev.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147988c37687---61806578803.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/75562426123.pdfIn PDF document text
    • https://interno-kazan.ru/upload/files/perofelokotopavewaf.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/79658328418.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/juropagasiwufexi.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB26 18472 bytes
SHA-256: ef81e899e4b2b1846e106de4ecb2598fd99bb203725292a102a8fdb3603a9708
font_01_sfnt_off0000ea65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA65 11636 bytes
SHA-256: 16c7be855caeff03276fca081b52b8301e0586c4efe57a7a49ce90fde0c56e99
font_02_sfnt_off00010625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10625 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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