Malicious PDF — malware analysis report

Static analysis result for SHA-256 da7ae8f502ccae19…

MALICIOUS

PDF

73.8 KB Created: 2021-05-02 13:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c97542ade8b902e13134c71847e7b70a SHA-1: e768ae587f13bfe430b0ac20c5a98d93ef7c38aa SHA-256: da7ae8f502ccae19dd07544cfb96616296a4c30846dbbce3da50f03da46d1e5a
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains an external URI pointing to 'zajinet.ru', which is likely part of a phishing or malware distribution scheme. The document body, though partially corrupted, suggests a lure related to a common household problem to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/strik?utm_term=why+my+ice+machine+is+not+making+ice
    • https://cdn.sqhk.co/wapogade/egfYhcP/sakozujij.pdf
    • http://dizititakozazi.mywebcommunity.org/39270575389.pdf
    • https://cdn-cms.f-static.net/uploads/4453888/normal_602c9edbc24f4.pdf
    • http://wubujonil.getenjoyment.net/baldor_bench_grinder_wiring_diagram.pdf
    • http://jadaribod.mygamesonline.org/advanced_excel_vba_programming.pdf
    • https://cdn-cms.f-static.net/uploads/4413223/normal_5fd988fa5f9da.pdf
    • https://cdn.sqhk.co/disonixures/1ibgiia/red_boy_pizza_larkspur_coupon.pdf
    • https://cdn.sqhk.co/ninilevikod/51jijaV/50710691744.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_f26828ffedbb4e20b3f5e400e6644f84.pdf?index=true
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_9a5c91881d4041a5a8dd2401dd3ad3e2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4a4cd191-9504-41cf-8dba-d1e644836f14/82013561496.pdf
    • https://uploads.strikinglycdn.com/files/5c8a732b-0d07-40a8-84d3-f8ec079e8f5c/va-405_5-in-1_universal_remote.pdf
    • https://54e283d8-6946-47af-b6e3-c78582312647.filesusr.com/ugd/22cd47_11b894e7e4e94ce3a70707cbfac2adc0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3c19e18b-7a87-4dcb-954a-d56f93eefe0f/dell_latitude_e6530_drivers_windows_7_download.pdf
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_a6ad5933747443098a38704f98b1e706.pdf?index=true
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_bdcbaaf62307435d808fa63cb7e128f3.pdf?index=true
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_ff8b61ba19f94430b87c1afb6dda58ed.pdf?index=true
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_6d65aefd71784d3da0b32b2e42711efc.pdf?index=true
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_0a75befc21d242fb9f2497d7d92d4c43.pdf?index=true
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_57f511851b744585978d1fcbb70d36bc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6dbbe004-4300-41f8-8245-19382a0a4d34/ripikawozasezoxigu.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_off0000e287.bin
bc6392c549840a7fcab95560f567d4b5db66a87cb50a2a73247964483d503ce4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE287 5264 bytes
font_01_sfnt_off0000f464.bin
8821efb496bf0dda77f7f20450ba870e0e8f98e57d614e44b8b75b823f7fc7e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF464 11192 bytes

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