Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed190bcee3dfd019…

MALICIOUS

PDF

96.6 KB Created: 2021-04-07 06:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b907446377389efb881d7005414dd9b7 SHA-1: 29a3587a8efd8838e72115309ad5405d6f3309be SHA-256: ed190bcee3dfd019f198352e8ab59deaf40be80345803225e9c494f044807c87
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many pointing to PDFs, suggesting a link farm or SEO manipulation tactic. One prominent external URI, https://nipisod.ru/strik?utm_term=what+pic+witty+answers, is likely a malicious landing page. No scripts were extracted, but the PDF structure and link farm indicate a phishing or malicious content distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=what+pic+witty+answers
    • https://cdn-cms.f-static.net/uploads/4415291/normal_604cb7ceed624.pdf
    • https://gavedomosuzutu.weebly.com/uploads/1/3/4/2/134234743/sowirekutotovugevi.pdf
    • http://cardioactiveuficiale.site/vadofurajunuwakovujatca74.pdf
    • http://temppicture.xyz/what_is_quantum_tunneling_simple_definition24xss.pdf
    • http://useporte.xyz/58606231686mlo0r.pdf
    • https://cdn.sqhk.co/zepinima/fhhGTgf/best_tuner_for_6._7_powerstroke_2019.pdf
    • https://cdn-cms.f-static.net/uploads/4462362/normal_60318924e2274.pdf
    • https://nunorapijepotiz.weebly.com/uploads/1/3/4/7/134736342/2268269.pdf
    • https://cdn-cms.f-static.net/uploads/4366324/normal_60436419590a9.pdf
    • https://cdn.sqhk.co/jabisopomuxo/jLjf8id/coin_pearl_drop_earrings.pdf
    • https://static.s123-cdn-static.com/uploads/4453540/normal_5fca767d1c4e8.pdf
    • https://cdn-cms.f-static.net/uploads/4490250/normal_6059226f3f14b.pdf
    • http://blacklaser.ru/zetisysi0a.pdf
    • https://jewakazakiven.weebly.com/uploads/1/3/1/4/131437085/liwulem-japokeka.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bulolimepol/zagg_keyboard_not_working_on_ipad.pdf
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_f00eeba5c77f4522b158e0e191a89c3a.pdf?index=true
    • https://b84c3727-5d5a-4c5d-9d5d-21cac87b3a69.filesusr.com/ugd/fdd6c2_8a0d853b01c644f996b0a27758f27296.pdf?index=true
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_c70a3edc528e48779744033497eb307b.pdf?index=true
    • https://s3.amazonaws.com/juzewojavomofew/android_application_auto_boot.pdf
    • https://s3.amazonaws.com/werowibovezoje/best_book_for_learning_html.pdf
    • https://8909b315-4d59-4940-aabf-0fdaa532e0ad.filesusr.com/ugd/4542d9_ddb21a1a2c4a4a679c7dbdcc11da7bd8.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012df7.bin
4ce61fc48423c62463d6b0a5d452bdce0754aa2fc35f28d065c5da29cde15a15
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF7 5196 bytes
font_01_sfnt_off00013fb2.bin
b10d599f5809ed330e8ff23f7fdaf2e4eb88c89951bd5bb5287c8d9ed89345eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB2 2216 bytes
font_02_sfnt_off000149dc.bin
ef2dd510156ec1c405dd678184f03a9a2bd3291c11e3c04e6db1b8054b754dc8
pdf-font-stream PDF embedded font (sfnt) at offset 0x149DC 12444 bytes