Malicious PDF — malware analysis report

Static analysis result for SHA-256 1188cd2dafae66d7…

MALICIOUS

PDF

81.5 KB Created: 2021-04-05 17:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5464233e72a9941617defa7b3da895f7 SHA-1: e4a0e8b5b5994868342ad553e36ccf39ff82866b SHA-256: 1188cd2dafae66d7b4fa0e6427ca52d93b27960ba29b27c720a4fe330ba12ee4
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a mass of external PDF links, suggesting a link farm or a method to distribute further malicious content. The presence of XFA forms and embedded URIs, along with a 'download button' lure, points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://botokaw.ru/123?utm_term=axiforma+font+free
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/3649065.pdf
    • http://hugertely.xyz/what_was_the_contemporary_civilization_of_mesopotamias2pb1.pdf
    • https://lagomumudalo.weebly.com/uploads/1/3/2/6/132681699/nogujinuxenasis-dobavem.pdf
    • https://xumebarukez.weebly.com/uploads/1/3/4/6/134687090/6383946.pdf
    • https://zakosolegim.weebly.com/uploads/1/3/5/3/135337695/537609.pdf
    • https://tafebitekule.weebly.com/uploads/1/3/0/7/130776603/9832381.pdf
    • http://tirojegexo.iblogger.org/41174202954.pdf
    • http://lisolu.org/c_est_genial_french_book_12th_guideqq3to.pdf
    • http://svoydvalend.xyz/20478859121lamke.pdf
    • https://rolutadaneked.weebly.com/uploads/1/3/2/6/132681657/2227869.pdf
    • https://kowumawadixowiv.weebly.com/uploads/1/3/4/8/134888970/tirupirit.pdf
    • http://dombitarf.ru/34651659398556xr.pdf
    • https://duketexu.weebly.com/uploads/1/3/4/7/134725944/kukorolexin.pdf
    • https://befewegumezozem.weebly.com/uploads/1/3/1/4/131453636/bozadenozuk.pdf
    • http://idealica-itufficiale.website/18473348045jyzhp.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_d092a36968d44f328049573d95e96ac5.pdf?index=true
    • http://velododitimof.rf.gd/clear_cache_di_android_oreo.pdf
    • https://42172c5f-463d-425f-bc49-3536d5e9b788.filesusr.com/ugd/3e9aab_ffac0f4c1f034433be246c02bfff24c3.pdf?index=true
    • https://b56e00ce-d729-42e9-814b-b9a4b194f5ba.filesusr.com/ugd/f6f93f_d165071d667a421483aac8aa90f9b045.pdf?index=true
    • https://uploads.strikinglycdn.com/files/45438448-99e3-49d7-8e1f-c3fc116bb066/how_to_use_snark_super_tight_hz_tuner.pdf
    • http://vufavaxotajoba.epizy.com/tone_it_up_workouts_arms.pdf
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_ff838c85239f4c89b12c2d5eee054570.pdf?index=true
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_b422b7eee0504550b41b2b3ab4b8df92.pdf?index=true
    • https://uploads.strikinglycdn.com/files/30b282d2-c4c0-4077-9767-61e4b4f560be/bibatuzofufep.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_off000103a1.bin
2b6bfe4a047039d7d7d70a471342a2e1899a7a4b07641c58bddc911a4404932a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103A1 4760 bytes
font_01_sfnt_off000113ba.bin
d7acfff110e9e9ea6ac16fb739ea1696cea32b8b87ba1ca16bf11ef3c58c31a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113BA 11084 bytes

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