Malicious PDF — malware analysis report

Static analysis result for SHA-256 db90b4a318654d82…

MALICIOUS

PDF

83.3 KB Created: 2021-09-16 20:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e955a91f639fc9b8261c97697d4f5f48 SHA-1: 5bd13d0e1b11cf1305dc1afed198a94ff3bc57c7 SHA-256: db90b4a318654d822a4e54b1a5caaabffafba6f2b6d46e8cf4fed517cca83d5f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains. This strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further support the malicious nature of the file, indicating it's likely a phishing or trojanized PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=android+keyboard+shortcuts+settings PDF link annotation
    • http://pc-driver.ru/userfiles/files/kelufojogisafowapuwav.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-12/20210912210937135497.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/kopizuxebiwape.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mijisozilofujuvukaf.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/28196830343.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/53898646569.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/bekatifu.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/sezefuzakulotonijesigog.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/83219170307.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/bujujegolaranej.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45958661481.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/55588976282.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/6458918090.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/10636803568.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/gosuwavojuzomadulame.pdfIn PDF document text
    • http://millecolori.it/images/file/37437200649.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/16428504241.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/96171137068.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/jebobobixusepaxaz.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/bokefo.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/wixinonuladefax.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/18621176362.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_off0000db7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7C 11028 bytes
SHA-256: 182a6de368dd115a35c94f625aba85af9febd26715ce5ad94bd1401dc1e5da92
font_01_sfnt_off0000f4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EC 18492 bytes
SHA-256: e60ae72e6cc5d5e0bc53ce32251d36b64c8289754d4f2b9b4a480998e0a94e00
font_02_sfnt_off00012574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12574 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.