Malicious PDF — malware analysis report

Static analysis result for SHA-256 194e7b78559ebe0d…

MALICIOUS

PDF

74.9 KB Created: 2021-09-17 11:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 45446c3a5927d5a4bf8c5af6481c3a2f SHA-1: 82a6ad6715f266f948595deb304bfdac367efb18 SHA-256: 194e7b78559ebe0db7717833e19bc10541ecccc9b2c9dde59dade30cf1112a1a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is identified as a link farm. While no scripts were explicitly extracted, the presence of external URIs and the link farm heuristic strongly suggest an intent to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://philabc.ru/uplcv?utm_term=inorganic+chemistry+housecroft+4th+edition+solutions+manual+pdf PDF link annotation
    • http://mamnonkitty.com/webroot/img/posts/files/67568725067.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/74120346076.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/76396749893.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/18237245198.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/90050605347.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/fuwavoxulotawapijime.pdfIn PDF document text
    • http://ukrfirework.com/images/file/saxaxinaxobumisupim.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/jazuroper.pdfIn PDF document text
    • https://avflash.nl/upload/files/daxobegoxoxowivasum.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109020522051181.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109081401115265.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/fanomezerubituvatiwolow.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/16964349665.pdfIn PDF document text
    • http://aerotherminsulation.com/userfiles/file/32915297408.pdfIn PDF document text
    • http://na3.it/misc/file/lutolusadenatulupezev.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/37750164813.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/39222114220.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/62956758266.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/78416339129.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb43b8a774---79421619049.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/52697144417.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/rivumekezawupekiwemi.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161324af8dc6e0---nikiremakekufedazeje.pdfIn PDF document text
    • http://metall-press.ru/files/63184285857.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_off0000bdae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDAE 17252 bytes
SHA-256: e6816372ce5de371408e30f5a39108af33f35b35d7d4d8e18ef8d0677d7db076
font_01_sfnt_off0000ea95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA95 11312 bytes
SHA-256: 000c24dd28963955afbfe5e915f04a249aa1ce368df57f064a072b694f1d9d03
font_02_sfnt_off000104de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1