Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f16ec5af91b3a6…

MALICIOUS

PDF

85.3 KB Created: 2021-09-19 13:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5fa4086fa7b94111f976a04c72dd2bf0 SHA-1: 8f704b4f874efb2b779c33231b084d9ca3519aa1 SHA-256: 37f16ec5af91b3a6898f38505c66a5a4abf7e4b7229dc7713fcf894af156a323
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The PDF contains embedded JavaScript and a large number of external URIs, many pointing to disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript (T1059.007) indicates potential for malicious code execution within the document.

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://smidgel.ru/uplcv?utm_term=instagram+comment+booster PDF link annotation
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/3a1ada2e6daf01a3e3fe992d8f37b26a/6866099422.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210903105110.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/pefunuda.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/55981866961.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109171355411208.pdfIn PDF document text
    • https://lesura.net/userfiles/file/muwikal.pdfIn PDF document text
    • http://africareview.in/userfiles/file/xapadegalusepekejuwo.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/xunisujanenopabizen.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/lonikinoditadivolefijib.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135c81bac13f---nunenonijinuzi.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/38966128176.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/bofasem.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0916773001630964884.pdfIn PDF document text
    • http://zerosquareonline.com/file/nezononusisukojizakizega.pdfIn PDF document text
    • https://paperland.bg/uploads/file/74769029982.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/93573800154.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/89977906124.pdfIn PDF document text
    • http://furniture83.com/upload/files/mozolupagesubesejinazazes.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/72326796511.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/6726816979.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/28589885311.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/99293072626.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_off0000e6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDB 10528 bytes
SHA-256: d73a5d7cab729ffaf9b21e2c03c6a08b09a468fac5cd8274f0f3e19271e6448b
font_02_sfnt_off000116d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D6 18692 bytes
SHA-256: 9da6cdeb38b5160fdbe1881d0079f8ed6e997338d70ba9a654312a0a0a51386d

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