Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a2b74d36b850b4…

MALICIOUS

PDF

83.1 KB Created: 2021-04-02 01:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76faa0ab8487f6eba25ecbd6635fcb2b SHA-1: eae1a60594e06f303e7e53d235a892228de9e538 SHA-256: 38a2b74d36b850b4082ba6637d354efcf6ea8e5fa1eedb2ebd360ffa6b52856c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one prominent URL pointing to a site offering 'growth hormone pills for sale'. This suggests a phishing or scam attempt. ClamAV and ML classifiers also flagged the file as malicious, specifically as a phishing trojan. The presence of embedded URLs and the link farm heuristic strongly indicate an attempt to redirect the user to malicious sites.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/wix?keyword=growth+hormone+pills+for+sale
    • https://cdn-cms.f-static.net/uploads/4366327/normal_605166abb89e4.pdf
    • https://cdn.sqhk.co/gonolesuzam/iONCgfp/wojuxodikoju.pdf
    • http://grinallex.shop/vomixapogiwepekixrm7ue.pdf
    • http://chistohome.moscow/muxotegamowawepexevtttt7.pdf
    • https://cdn.sqhk.co/wavefekus/jhFOBhg/72057548141.pdf
    • https://gusoberususot.weebly.com/uploads/1/3/1/4/131454899/zixajefamujob.pdf
    • https://lovilubavovujag.weebly.com/uploads/1/3/4/6/134664731/joxuvajo.pdf
    • https://cdn.sqhk.co/nezafomura/giOVxo3/bloqueo_av_1_grado.pdf
    • http://pokypka.xyz/87068052355e27xy.pdf
    • http://bezprovodov.guru/construction_project_management_best_booksygpky.pdf
    • https://cdn.sqhk.co/dubikureta/k2diigi/nuzinibavasanewerudive.pdf
    • https://cdn-cms.f-static.net/uploads/4369504/normal_601851521efee.pdf
    • https://cdn-cms.f-static.net/uploads/4444100/normal_604acc550c6d0.pdf
    • https://webegerux.weebly.com/uploads/1/3/4/7/134759049/debuluputopip.pdf
    • https://cdn.sqhk.co/kukisigafumi/gi5fngc/4724521916.pdf
    • https://cdn.sqhk.co/levowexesu/3CWhfyl/menonozomak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_e3c2011debe24beda89e90ff88357b1e.pdf?index=true
    • https://47ab6ce1-aee6-4086-a8e7-31fe393d2411.filesusr.com/ugd/afbef4_8c7979eabb744d3a83a1f497e686b1c4.pdf?index=true
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_7b36449990874231aafec3c6e447082b.pdf?index=true
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_6901f57d1a974994aeac7949c57cd667.pdf?index=true
    • https://05790d5e-93e9-4545-bcc4-99c37f081c18.filesusr.com/ugd/bff4d5_25559782eb2a43c3959b30ee9bbb2f2f.pdf?index=true
    • 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_off000107d6.bin
c228831593f6dae224d8cc34a124a0df5fb241fb4df6bc0a1b1114bebff91e0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107D6 5264 bytes
font_01_sfnt_off000119a5.bin
d6989a0a37cfa8d3efeb3d6abfa1305972defb6a752afd106437debdbb05bee6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119A5 11120 bytes

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