Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27826c1054e82a5…

MALICIOUS

PDF

67.8 KB Created: 2021-03-31 09:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f88b15f63e5e18ff009fec13ed5c6d04 SHA-1: ccac45ce3ac7d2c5024873116d73fbcbaff62756 SHA-256: f27826c1054e82a557803ca2fbc855956d5e1854890d3bf6499412306cad6a0a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on various platforms, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://jacksth.ru/strik?utm_term=black+powder+red+earth+patches
    • https://cdn-cms.f-static.net/uploads/4413361/normal_6011e4bf99ac8.pdf
    • https://noxesole.weebly.com/uploads/1/3/4/6/134615833/zusumel_lipizebamajo_forinapogexowo_kamitumigifagi.pdf
    • https://fefefilax.weebly.com/uploads/1/3/2/7/132712664/sapebu-sugiwu-muvodabu-zupasitawilifov.pdf
    • https://static.s123-cdn-static.com/uploads/4426408/normal_5fcdb2ad71871.pdf
    • https://cdn.sqhk.co/mowasikuso/ZHTjjjb/53778625196.pdf
    • https://cdn.sqhk.co/maxevurux/vxhdjei/zombicide_tactics_shotguns_mod_apk.pdf
    • http://gekifek.scienceontheweb.net/what_is_a_functional_analysis_in_engineering.pdf
    • https://gasimela.weebly.com/uploads/1/3/1/3/131398285/kisoromezetigu-dopeg-ziwuximuf-wafevisupipata.pdf
    • https://koropiliful.weebly.com/uploads/1/3/0/7/130740252/fb30f.pdf
    • https://cdn.sqhk.co/lukumuzu/heFXmgf/fruit_ninja_mod_apk_free_download.pdf
    • http://talajudoxuxip.mygamesonline.org/nononajitopebegijizoxa.pdf
    • https://cdn.sqhk.co/lijuwezasip/xgfdgea/resuwerajojiravulubome.pdf
    • https://cdn.sqhk.co/noxuluni/LK5gfii/ice_cream_blackpink_dance_cover.pdf
    • https://cdn-cms.f-static.net/uploads/4411683/normal_604923d1c92d3.pdf
    • https://xotukowigadane.weebly.com/uploads/1/3/4/6/134683058/sedoloreluluwut.pdf
    • https://cdn-cms.f-static.net/uploads/4404123/normal_5fe894e0d7b16.pdf
    • https://cdn.sqhk.co/kuwusemob/ChJqhfz/maxeruzigijuk.pdf
    • https://cdn.sqhk.co/navuwamas/aiwbigl/kids_kitchen_stool.pdf
    • http://kirakexig.mypressonline.com/jusobebumamili.pdf
    • https://static.s123-cdn-static.com/uploads/4393348/normal_5fef7e66f3696.pdf
    • https://cdn.sqhk.co/fenazijeguk/Kgcjcl1/ghost_n_goblins_mobile_game_ever.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8e3ebd61-0224-48f8-885f-bcec51e59cc7/what_are_some_ethical_issues_in_psychology.pdf
    • https://uploads.strikinglycdn.com/files/0596e04b-485e-4728-a370-cce83c7f36aa/14279482869.pdf
    • https://uploads.strikinglycdn.com/files/b60050d5-7087-4525-9452-701ab71d7600/magic_chef_wine_cooler_mcwc50dbt_not_working.pdf
    • https://uploads.strikinglycdn.com/files/23c2bde4-c402-4f60-819c-05654b352d08/mezegelusuxasosegitofulop.pdf
    • https://uploads.strikinglycdn.com/files/80376a09-46ac-4589-a1cb-4307a2d899c8/letoxomototowumibugi.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_off0000caf5.bin
691aca96a726038db77afe7d6546403a6bcf31e1a54bcc19d0f02dcaec501c7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF5 5368 bytes
font_01_sfnt_off0000dd41.bin
11804b9cd7c3fc22daf05d8144209e8ddac373668ac14885feb3ffaf62027a1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD41 10724 bytes

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