Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe77a339bc36bb9c…

MALICIOUS

PDF

71.3 KB Created: 2021-09-30 17:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1743c4dff127b1c7c84c0e52d8989f86 SHA-1: 92c29c4ebd1d8f5353cd62fc125403746af07613 SHA-256: fe77a339bc36bb9c6b6695449b488fd9f2e6728163edaff5b2d10efe7bf57672
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains or appear to be part of link farms, suggesting an attempt to redirect users to malicious content. The presence of PDF-specific heuristics like PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=receive+sms+online+verification+apk PDF link annotation
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16140769a4874f---fawuzujedovigik.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/9860360003.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/rerefodolunewukexa.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/lalirafufag.pdfIn PDF document text
    • http://anpharma.net/upload/files/30842489591.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/80710731406.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/sekanojatame.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/juwugetimura.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/17357891275.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/pavilitezuxofumup.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/gupedefo.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/75698955738.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/67129038662.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/juluto.pdfIn PDF document text
    • http://ducnhua.com/upload/files/supedinesizejepirijukijan.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/45316718473.pdfIn PDF document text
    • https://harom.ro/files/file/4629475164.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3a0707949---vizozolozumij.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109300530338376.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/59791382106.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/netipakiwizidukurapifaji.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_off0000aee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FA 10844 bytes
SHA-256: 5d2a36d21be269fa1490a0bc35bb09b2b30467171719514b66a8df4a09d16330
font_02_sfnt_off0000e00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00B 17876 bytes
SHA-256: 8b31f8eee00eed121faa5b0b1324b3aed66e9dbb1094a589423340a11e99f32a

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