Malicious PDF — malware analysis report

Static analysis result for SHA-256 531ab71b92beb74d…

MALICIOUS

PDF

85.5 KB Created: 2021-03-20 21:25:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87fe6763944e833d1136301c361bba97 SHA-1: 7e86c267b5a807861f39083cf2af7da008b05390 SHA-256: 531ab71b92beb74d49393aaab720596a59a3c94fd1def42e48769aff2e7108dc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting it is part of a link farm or designed to redirect users to malicious sites. The embedded URLs point to domains commonly associated with phishing and malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate a high likelihood of malicious intent, such as phishing or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://seumenha.ru/wix?keyword=diffuse+reflection+examples
    • https://jonapofa.weebly.com/uploads/1/3/4/6/134699055/3253096.pdf
    • https://vefonero.weebly.com/uploads/1/3/1/0/131070196/tokobijabo_gukogefiv.pdf
    • https://cdn.sqhk.co/fesakesovoka/jiCeq8D/2558010092.pdf
    • https://cdn.sqhk.co/sileluzorupo/jagLifc/33475585818.pdf
    • https://bovuzujavus.weebly.com/uploads/1/3/5/3/135326818/fapanigekupenejita.pdf
    • https://cdn.sqhk.co/wituwuxevef/fijlMje/ionic_bond_vs_covalent_bond_worksheet.pdf
    • http://termo-nord.tech/pazetalememixopemofewolacbol.pdf
    • https://static.s123-cdn-static.com/uploads/4451377/normal_5fce9407d6a85.pdf
    • https://static.s123-cdn-static.com/uploads/4446026/normal_5feec10a66cbe.pdf
    • http://beliyden.xyz/50533634426waggo.pdf
    • https://cdn.sqhk.co/lajawawinu/baVhjQ3/xajagofiwidebebusa.pdf
    • https://sizojupitad.weebly.com/uploads/1/3/4/3/134332657/c9fa5e.pdf
    • https://cdn.sqhk.co/zanotunuzi/SYgchfT/calgary_racing_pigeon_club_race_results.pdf
    • http://profapp.pro/ninijadajovejibofabikixowdlng7.pdf
    • https://cdn-cms.f-static.net/uploads/4447265/normal_60216316e7984.pdf
    • http://hdvideo.design/weber_genesis_ii_e-310_natural_gas_canadazu704.pdf
    • https://nenonafadigis.weebly.com/uploads/1/3/4/8/134856929/buvodobu.pdf
    • http://lavka-karamel.ru/what_are_the_two_types_of_conflict_in_literatureh7dyk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://s3.amazonaws.com/napejaxosinages/ardour_free_windows_7.pdf
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_ef2730b6d3b244b1ba40838ccb6a5b74.pdf?index=true
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_a053cbf643b740ed829b1ba6fff334af.pdf?index=true
    • https://s3.amazonaws.com/tokit/ielts_opinion_essay_structure.pdf
    • https://s3.amazonaws.com/pukaridimupo/how_to_get_an_emergency_doctor.pdf
    • https://s3.amazonaws.com/kizugokofo/bootstrap_form_validation_template_free.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
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc22.bin
f7e5bc61874d186a052a0c25164b738417760ff12277b300847f86a3d40aabb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC22 5228 bytes
font_01_sfnt_off00010dde.bin
96d0689944a867c44ea99fdd73ae2af5dc9cb6894fa01c132276cddc5de045f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDE 8148 bytes
font_02_sfnt_off0001247f.bin
ca508c5507f38457518e43910f61825510036d4e7b9612f8c821dd22fd102416		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1247F 10624 bytes

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