Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c846a55aa7521ec…

MALICIOUS

PDF

79.0 KB Created: 2021-09-19 23:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e7531164a9f1b241f1398fc3eb431415 SHA-1: 5bcd90ecffb9037fbd1d65e09453eef6fa33103d SHA-256: 8c846a55aa7521ec79e0586841aa75508e8aaa0299cd992feb0d17995a60ae68
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable domains. The presence of numerous embedded URLs, many pointing to suspicious domains, supports this assessment. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://studiovalecchi.it/userfiles/files/venovulosuminaxogumogenad.pdf In PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/lusis.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/269287236.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/nesovujegosobebugimakafaw.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/42b29ab22246b5424a4302b34440a6bd/zinexikijuna.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/450935b7718445941a85beabd1785b5b/97053022692.pdfIn PDF document text
    • http://beta-rc.com/upload/files/jukilagugurajagak.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/duwikukojuminug.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/kifimonaniromun.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/dijofoxirep.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210903183316227.pdfIn PDF document text
    • http://toonesk.com/upload/taxevifemonaramufinobubak.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/vunafiwitimapoliz.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/zuvagixa.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/lovugufeveba.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/33640566609.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/rodenew.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/62675013902.pdfIn PDF document text
    • http://www.orthovision-lublin.pl/ckfinder/userfiles/files/tubetibafikinotus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=beginning+with+uPDF 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_off0000d40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40E 17356 bytes
SHA-256: f1c02fe83782939103b34a0091cd27d4ff3e4daf2aa2ef9ae788c8df64cb6ff1
font_01_sfnt_off0001006f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11886 10028 bytes
SHA-256: 44192178c773badc5bea1034f0bc67914aae01b5f91bd2e3e1a9ee3686c710d1

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