Malicious PDF — malware analysis report

Static analysis result for SHA-256 90fe88fb3f39f7ca…

MALICIOUS

PDF

80.4 KB Created: 2021-04-28 22:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15152b0ee7068d1ce953fc5ecea80775 SHA-1: de4a70fdf2461082e7aab8fc1db7938136fcff61 SHA-256: 90fe88fb3f39f7ca8e796e77fe83cb4dd6bd7175b73ccfc3dd749c2e40c2cdc3
96 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains an embedded URL that leads to a suspicious domain, likely intended for phishing. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to lure the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://zajinet.ru/strik?utm_term=are+fossil+automatic+watches+any+good
    • https://static.s123-cdn-static.com/uploads/4368951/normal_5feddc61de448.pdf
    • https://static.s123-cdn-static.com/uploads/4462056/normal_5ff8b0d39408a.pdf
    • https://cdn-cms.f-static.net/uploads/4527345/normal_60505ece7221a.pdf
    • http://smartradiobf.ru/77807864771z47t4.pdf
    • https://cdn-cms.f-static.net/uploads/4478685/normal_602802e97da67.pdf
    • https://static.s123-cdn-static.com/uploads/4415309/normal_5fcc20558797e.pdf
    • https://cdn-cms.f-static.net/uploads/4445338/normal_6032a5649ab4d.pdf
    • http://neojust.ru/gesudatijek2di0f.pdf
    • http://ebay-coupon.ru/cute_pets_for_adoptioneozh8.pdf
    • http://lotusedafefuwi.22web.org/dow_jones_sustainability_index.pdf
    • https://cdn-cms.f-static.net/uploads/4421641/normal_606499da77eb3.pdf
    • https://cdn-cms.f-static.net/uploads/4383561/normal_6040aeaa0b6fd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gudukupir/how_much_does_the_reserves_pay.pdf
    • http://vukagafiperi.rf.gd/ausencia_de_conducta_derecho_penal.pdf
    • https://uploads.strikinglycdn.com/files/aa72ee27-d0d4-4c70-9020-f8d9cee3199a/how_to_change_aspect_ratio_on_hitachi_tv.pdf
    • http://pododopinaziso.rf.gd/craftsman_garage_door_opener_keypad_battery_replacement.pdf
    • http://zitoxilafeguxu.rf.gd/toritirep.pdf
    • http://xifonefoje.epizy.com/what_is_the_meaning_of_misguided_elements.pdf
    • https://s3.amazonaws.com/tezofuretejom/82688113446.pdf
    • https://uploads.strikinglycdn.com/files/73dbca30-f8a5-4439-b998-aa27576575e2/tejaki.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f911.bin
9f1d41d739aa816bbc8e120bd04bb0a4c9cc51341cdb05ed64cef02712e55820
pdf-font-stream PDF embedded font (sfnt) at offset 0xF911 5620 bytes
font_01_sfnt_off00010c1c.bin
d33b99fc9e5c2f3cf23be29f2f5f798d5426ceaeef40ba7c9cca3b843403575c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1C 11360 bytes