Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c9312908dbed95…

MALICIOUS

PDF

68.4 KB Created: 2021-09-11 13:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bddd365496e8d65007cbe42ac51fcb8b SHA-1: fcdce51bc5bde132df0541ae5579f1354d133498 SHA-256: b3c9312908dbed95f5f7f2725553ea16ea16d13a8424d923673eed6c4b5bb210
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, including one pointing to 'smidgel.ru', suggests the document is designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the document's primary purpose is to host a large number of links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://smidgel.ru/uplcv?utm_term=best+free+tetris+app PDF link annotation
    • http://finalbrand.cz/upload/file/zazazigifoxogufuwedufezu.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12986186227.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/fagawobeleb.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/fimunejisira.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/59208364254.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/2347321962.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f039815bc---76023001442.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613488096a8c6---58666043022.pdfIn PDF document text
    • http://sjhtractor.com/d/files/56300592536.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/77741120031.pdfIn PDF document text
    • http://halmar.info/userfiles/file/pumidosuzaregorewuloxe.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/tezilobimuwaz.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/9462773590.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/36231122935.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/guzixezikog.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/6700732672.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/99235398696.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/22896706397.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/68774701332.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/20451795530.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/34350636203.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/janifigisujawovesimigi.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/sugivekososopin.pdfIn PDF document text
    • https://cmoretv.com/userfiles/16627543018.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/49914142589.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_off0000afc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DB 10132 bytes
SHA-256: 71eaab72a8b16ef8e36189583516f466d955abca0c612d9de12ae9aee156f142
font_02_sfnt_off0000deaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAA 15016 bytes
SHA-256: f579286924499658f6c9bfe8c3481b40ce5ef30d573760d1bbd63d07ecc8b5e6