Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b782c8a96bddf36…

MALICIOUS

PDF

80.0 KB Created: 2021-10-21 00:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 64991d43c4f2f771483000bf696b6ade SHA-1: 4828e0b1f47a8cc7a3e59365a37864dd06e9dd67 SHA-256: 7b782c8a96bddf36fafbf3270b71ac9b055fac1a48ab16ed486900db4b870058
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on disposable domains, with one URI pointing directly to an IP address, suggesting a phishing or malware distribution scheme. The PDF structure and numerous embedded URLs support the conclusion that this document is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://kaplaitalia.it/userfiles/files/juzopegisu.pdf In PDF document text
    • http://zap-interactive.com/uploads/files/57927395150.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/15021719331.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/8318205402.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/31688598775.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/vekalotibefu.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/7ba69c1b3a5f20c1b4ecce0d9091ba08/vedibesalelalufaf.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/vixibenozusazura.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/29308855111.pdfPDF link annotation
    • http://aaz.sk/editor_uploads/files/74768285872.pdfIn PDF document text
    • http://7profi.net/userfiles/file/medupogemufukefogopi.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210912121709_1692773455.pdfIn PDF document text
    • https://alev.az/userfiles/file/81094487384.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/51402630078.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/58352843220.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/35349280308.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/kusivab.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/83613202213.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/zilonofewapanudafadobon.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/71677614864.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/gevoxiraguluj.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/59460788238.pdfIn PDF document text
    • https://windscrm.net/files/file/32569705146.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/42979988284.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/60705390560.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/BcFPVxLj4jw/uplcv?utm_term=purple+roots+red+hairPDF 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_off0000d36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36B 18160 bytes
SHA-256: bf53269f7e9febc38afad6bf752b24e6b7370e2e2d830dbae755b58f35f26614
font_01_sfnt_off00010298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10298 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAF 10484 bytes
SHA-256: bab465a31a203c55c6776f12604123b2b96b0c312689712be663999ab877392b