Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb271576b9adc467…

MALICIOUS

PDF

81.0 KB Created: 2021-09-10 21:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6b1a2276434a7a587b009fff73dce41e SHA-1: b8a917a119f086d48b6bf8feba574595fe5eb671 SHA-256: cb271576b9adc467f737975668d9458017927bbd418f6931fd9a5b80d6603daf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, despite some being marked benign, point towards a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the nature of the links as a potential lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://tootingtaxi.com/survey/userfiles/files/wovorizawapote.pdf In PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/dijupiroseg.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/72206767935.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/99255758528.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/67851077514.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/jegofanojitidufaleme.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/72311428045.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/64624594931.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/76281030632.pdfIn PDF document text
    • https://magerp.org/upload/files/zugajezakanapemozijip.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/71282359629.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/nutevaxuwepimobenafix.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/puwotodupiguvonu.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/63209311924.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/sapukipivilagezi.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/nukudibijekiwujinige.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/raxozovodurigazarizozej.pdfIn PDF document text
    • http://www.520amis.com/upload/files/82663321850.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/bosidesotivozudowetara.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109050009121364.pdfIn PDF document text
    • http://taigesw.com/upload/files/32250013141.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135be01ab65e---tobaxok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=font+generator+for+androidPDF 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_off0000d6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF3 18528 bytes
SHA-256: b5473c2ed56488b2bcc6f6ec0733f646893b217469e7a28aaf7560d97d1e0b11
font_02_sfnt_off00011f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F79 10292 bytes
SHA-256: 1493e53e6e79b8fd54f6886f4777cbccf67b5b6812a3b4ae1d66b51dffe7e4ba

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