Malicious PDF — malware analysis report

Static analysis result for SHA-256 966dd2c51080193c…

MALICIOUS

PDF

68.5 KB Created: 2021-09-19 21:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ae21d0ad6817ffdfc351e3178ae21199 SHA-1: 72141aa0050c5259c2265c15dafa3ae276a0e78d SHA-256: 966dd2c51080193cee23998eed61f22c3e837768b676e7bb710f0f97d8196da5
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF sample was flagged by an ML classifier as malicious. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, with one specific PDF URL identified as potentially part of a disposable hosting scheme. While no scripts were extracted, the presence of embedded URLs and the link farm heuristic suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 4

  • 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.
  • 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://travelsafeway.com/userfiles/file/32968057145.pdf In PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2bf57afb9---duzubuzozexesabazakinij.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/febegamivupebitolovajuku.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/makekuxugideloxusatelilo.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/31185729832.pdfIn PDF document text
    • http://ekouklid.eu/UserFiles/file/rozagirududojub.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/balasenozinon.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/85068658728.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/49061753331.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/16228344264.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/46739032838.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/vivewekibeb.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/tasomulo.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/73487958066.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/28407723596.pdfIn PDF document text
    • http://mousike.it/img_ins/files/luwizusemew.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/86692279077.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/67129768665.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/vosufatadadomasolusak.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/82959971933.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/xarupisabaneminuxazuzar.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/sebozixijisimeraja.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/c7913d3db45a9053fb0f1ea7410911dc/44621858281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=fifa+19+apk+modPDF link annotation
    • 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_off0000af53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76A 10300 bytes
SHA-256: dea3fbebb2c3ac5d456d0436b0af43460c61b0774ba7d582e9d6c79bc827b11d
font_02_sfnt_off0000de9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9E 15168 bytes
SHA-256: f9953e8d69205de022684de5187585c294a873467a572e2fb404e1ee9747539e

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