Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab056f050e107840…

MALICIOUS

PDF

66.0 KB Created: 2021-04-08 07:39:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d1f19bc5835b74863e0e2af62b5a416 SHA-1: d148875065204b739ee4c00ee25c12113788c8b7 SHA-256: ab056f050e1078407427298f65efbd5aafdd87f86907f34367b76f0668a1840b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan threat. The embedded URLs, such as 'https://jumiwimov.ru/wix?keyword=balancing+chemical+equations+gizmo+answer+key+activity+b', are likely used to redirect users to malicious sites. No scripts were extracted, but the PDF structure itself is weaponized to facilitate malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/wix?keyword=balancing+chemical+equations+gizmo+answer+key+activity+b
    • http://form-lnstagramverificationbadge.com/caremark_prior_authorization_form_for_proliaksqk4.pdf
    • http://ilook.market/ge_washer_timer_repairqz44q.pdf
    • http://sumomubidisuwo.iblogger.org/vikikagemutaxapefat.pdf
    • http://fimanarivat.22web.org/babobidu.pdf
    • https://sunupukub.weebly.com/uploads/1/3/5/3/135319403/c18f7dbe348ef.pdf
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdf
    • http://pijirikuzi.iblogger.org/34563973692.pdf
    • https://static.s123-cdn-static.com/uploads/4389107/normal_5ffbd7e0d5842.pdf
    • http://vovality.club/how_much_do_you_get_paid_for_selling_leave0i3gp.pdf
    • http://probmake12.xyz/el_principito_online_pelicula_completaqprhy.pdf
    • https://static.s123-cdn-static.com/uploads/4471096/normal_5fffa4ec5d67c.pdf
    • https://mamasikixatok.weebly.com/uploads/1/3/5/9/135961158/665ad848ae.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/temujonuwu/ibm_doors_9._6_user_manual.pdf
    • http://jizabimumonox.rf.gd/reported_speech_positive_sentences_exercises.pdf
    • https://s3.amazonaws.com/tesapibebujep/aggiornamento_android_9._0_s9.pdf
    • https://s3.amazonaws.com/guxosa/how_to_scan_a_document_using_canon_mg2120.pdf
    • http://rixexovujawuvow.rf.gd/how_to_activate_proform_ifit.pdf
    • http://gafomawonerif.rf.gd/pufezopajivupurobupamunij.pdf
    • https://s3.amazonaws.com/liluvad/40721670635.pdf
    • https://s3.amazonaws.com/fajixe/78339393815.pdf
    • http://ligexaxo.epizy.com/3d_shapes_worksheets_printable.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_off0000c4bb.bin
044fb89966bc720ae79456d0189b44684525f66f7bee88c848256addf2000075		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BB 5896 bytes
font_01_sfnt_off0000d8c1.bin
64441f6884f838063d3cf8ba7295c818505d1cd7a582cae0248b96afbe0f9a4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C1 9912 bytes

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