Malicious PDF — malware analysis report

Static analysis result for SHA-256 97d0c38dc32a14e7…

MALICIOUS

PDF

75.4 KB Created: 2021-09-14 13:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b291f321f722475fa1943899019b8ccb SHA-1: 50ed43305652380bc7655919fa9e350f80578f6f SHA-256: 97d0c38dc32a14e7da610592c7926c77952b3b5e66ed7758e96a70ceafd68fc4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains or are used in link farms. The embedded JavaScript likely serves to obfuscate the malicious intent or to facilitate the redirection to these external links, which are designed to lure users into downloading further content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=applock+pro+apk+download PDF link annotation
    • http://idcla.net/upload/files/96852442616.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/13459536657.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8cdcf3dc2---69553743488.pdfIn PDF document text
    • https://shunnasato.com/sabonidas.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/10566429527.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/94387523272.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/33781811808.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/10728061426.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eddd986a2e---64608287458.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/72290243515.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/91823439675.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/lijodutokuwekar.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/22620240947.pdfIn PDF document text
    • http://koala-al.com/d/files/58267207630.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/tatuxijoselojanotig.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/riratemuzazekexegal.pdfIn PDF document text
    • http://soles2walk.cz/data/file/majivedelajakulila.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/wafotuditefepalenetarabad.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/varobesoxipokivotuj.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/22752671983.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/85238579230.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/jotegix.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_off0000c1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F4 10176 bytes
SHA-256: 6bf9e51bf1cd5d7138ed838e6ae03f3f1164d2bda5c031ecb6ff94c9b9154130
font_02_sfnt_off0000f0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E8 17996 bytes
SHA-256: 38f0cbc39beab1e68cd6a2b030bebc1ef5162b161dc06fcc60002ff735a54329

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