Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d22d02cb0b2322…

MALICIOUS

PDF

72.1 KB Created: 2021-09-26 15:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 86b0682b0716ac7819a2886e1c699390 SHA-1: af0877a84b2e01817dfb8c437d03954db3827264 SHA-256: b5d22d02cb0b2322cd703c400041422f9e88541f908021b76d1e0defb01199f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged as a link farm by heuristics. ClamAV and ML classifiers also identified it as malicious, specifically as a phishing trojan. The presence of external URIs and the link farm nature strongly suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=turn+on+data+saver+android PDF link annotation
    • http://stark-tools.ru/images/uploaded/tixoxotavuxe.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/32224950276.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/fejalizuwuvawemoxev.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/wesuvibodimosepelalojuw.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/sutukoluzinanixotew.pdfIn PDF document text
    • https://oz.korytnica.eu/data/files/wugejozaluxixako.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/widezasumo.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/levabaravujukasunofexi.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/vagefowit.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/3019330719.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/86087875176.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/gunavagiza.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/73751382634.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/88675331806.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16149b32d3fd0b---834484371.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/rosexomavuse.pdfIn PDF document text
    • http://network-italia.it/file/859190956.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/35678311331.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/17864571189.pdfIn PDF document text
    • https://kaimano.it/file/butipakigirewowezu.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/80510508632.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/nepupatiloropodixaju.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/3141053050.pdfIn PDF document text
    • http://healthywithhart.com/res/file/xeduviromonado.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/nuseduwurasetutok.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///xadurolapiziju.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_off0000b43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43D 18344 bytes
SHA-256: 430396f2d66bfce6ea43ec7272be3a2f7b391a588677368a9874276a9266eeac
font_01_sfnt_off0000e349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE349 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB60 10324 bytes
SHA-256: f3d2dac7c8cc7abfc86c2f27f3c350b88fad1651197d04c488f4e41c72f5d10d

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