Malicious PDF — malware analysis report

Static analysis result for SHA-256 d22dcc31871a5918…

MALICIOUS

PDF

86.5 KB Created: 2021-09-22 19:34:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e172d9b1f6cf7bf779ee2f97b4fdcf52 SHA-1: cfafade219190599b7f0999512f3ef937a2f2451 SHA-256: d22dcc31871a5918d477e0bd98e9f59963a2f1128a5bdfa07258ad326721ca6b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The embedded JavaScript likely facilitates the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://oniceh.ru/uplcv?utm_term=best+android+phone+on+the+market+2017 PDF link annotation
    • https://sunarchegypt.com/userfiles/file/36265800633.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/numikewafulanavifapaf.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/57221625470.pdfIn PDF document text
    • https://n-tlg.com/files/file/89976866885.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/kudis.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/dogilozopixe.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/36518465444.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/44622065629.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/finojaravonow.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/504506458.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/18767160712.pdfIn PDF document text
    • http://anninh247.info/upload/files/zereb.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/77479631855.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/7vpc116ojed9e5ctjvcu6k5q65/depulenaz.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/jefowopupozefemud.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/22563876872.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091804563743.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/beruxuvufobubufow.pdfIn PDF document text
    • http://www.moyekolodin.com/files/budovulu.pdfIn PDF document text
    • https://eetravel.net/file/64703940935.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109190459526951.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/93883767299.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vebenudosutegowogifijep.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/92278850046.pdfIn PDF document text
    • http://rurisnet.org/images/file/65871273993.pdfIn PDF document text
    • https://pqclass.kr/imgs/file/gogupa.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/1b4258719bf653805b10ec8003d4c1f3/kopukudebaniborowigiginos.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_off0000ebd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD5 17620 bytes
SHA-256: 1dfeaf00c7353ffe93c3bf692f53bb5dd61098a0f6368306346eeae516157784
font_01_sfnt_off000119f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001320c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320C 11100 bytes
SHA-256: 43f5fff671d704ec0db67dd1327457224005b6ac2df4edbed3eef50cf057e31d