Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa3f99e7d8f41b2e…

MALICIOUS

PDF

82.3 KB Created: 2021-09-13 16:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3c6512c582edc64583ebdcca6e60119f SHA-1: 9112c7e4b3b0de172a801bb3bec82690f2530ed4 SHA-256: fa3f99e7d8f41b2e04cce0bd1616f0a24c9a5242aea05e0f893ac6e7f161a1da
126 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous external URLs, indicating it functions as a link farm, likely to distribute phishing content or malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this purpose, with many distinct hosts and a high number of links per host. No scripts were extracted, but the PDF structure itself facilitates redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 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://infrive.ru/uplcv?utm_term=turbo+racing+apk+mod PDF link annotation
    • http://muabannhagiare.net/images/uploads/files/48924494297.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/pukomageboke.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/bunasoposekij.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/97237466633.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/vosamukibibo.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8788227e7---56235999363.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/10544150392.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/4761575707.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/16728694738.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/nidunukiwowowa.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/vimedodixuwewudusalaf.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/75360078235.pdfIn PDF document text
    • http://go-forum.cn/upload/files/gifadajamotewotabuzakanoz.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/zusajabijitisixojofizedoz.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/6c0447a741e8883adf3c24704b511646/84305736250.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/45119444269.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/14174956803.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/xidoxugijup.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/depaku.pdfIn PDF document text
    • http://topflexsports.com/uploads/52168731165.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/dobixuzanobuvufapasine.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/94300284181.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/bokexefaposukemenuvumokul.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_off0000dafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 18872 bytes
SHA-256: d094fb3c467f91292ff5126e6f9dd0b92462800d54bc9f604741c800c9b0b9ca
font_02_sfnt_off00012449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12449 10708 bytes
SHA-256: e60014ad2150d32ca318fede918b04d8e1696d85383e49cc8c8af4b95008e1a2

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