Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b04462b5be2396…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 20:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: afb4cf37ca1f13dd2068e4e77a993f61 SHA-1: b1dc7190d3f7591a709c25af1f1f1dd9861a6a1d SHA-256: 85b04462b5be23964caf4147fba592168b194986521ddc2565f9f07adbeca706
166 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and exhibiting characteristics of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple PDF_URI firings strongly suggest a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection further corroborate the malicious nature of this PDF, likely used as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://irlanc.ru/uplcv?utm_term=ninjago+shadow+of+ronin+apk PDF link annotation
    • http://golfvillageonline.com/userfiles/file/41712474723.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/berujajetivofepuxedoba.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/kumuzat.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/zulivajina.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/dejexepufixosejekovaxos.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/wodazumupo.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eecd9882c4---zifajefe.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/23384856979.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021971533126807.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/98037321481.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/bepubavipapijoxijonutori.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/890550656.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/58159519973.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/62729216521.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/xogapesazixaleliwebemogu.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210908145710.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/1218556908.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/44374317697.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/98315396600.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/70860194707.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/33052372588.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/visize.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135dae23d84f---7445877352.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/lamepizabedowogiworazaju.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/jofezoduzuwivuzu.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/lilidizenametidefowar.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_off0000d75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF74 10784 bytes
SHA-256: ed2f206a32f15e2903db6024142710c5199830b754e5f810e257e0a5d682bb3d
font_02_sfnt_off000107f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F8 17388 bytes
SHA-256: ce6d36d03f47b355b5c692f24c8f9fdac31a3404460201d7f945250d12531302

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