Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a390f4d6cca04d…

MALICIOUS

PDF

88.6 KB Created: 2021-04-20 15:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 21fafc8418a9aa46fb31e45a4eaa761f SHA-1: ecdd83038f336bed82457bfa43b0cff908a3bc3e SHA-256: 83a390f4d6cca04dbe4124141051ad40103dfb4e7fe9383915e7aad1f4d46e87
216 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'link farm' designed for SEO manipulation. The 'SE_SECRET_RECOVERY_LURE' heuristic indicates the document likely prompts the user for sensitive information. ClamAV also detected this as a phishing trojan. The presence of embedded URLs and the overall structure suggest a phishing attempt disguised as an academic document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://fokemale.ru/strik?utm_term=introduction+to+post-quantum+cryptography+pdf PDF link annotation
    • https://cdn.sqhk.co/begesiki/Ejjiihg/ambidextrous_organization.pdfIn PDF document text
    • https://cdn.sqhk.co/pubusudes/heohhia/new_dc_marvel_animated_movies.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/XRigAgc/pupugijalod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://02664c88-84e5-42fa-aae3-682d3a0d4328.filesusr.com/ugd/39d081_9c389fcde97f42aa9fcf2d7f3af2897f.pdf?index=trueIn PDF document text
    • https://94cb5446-44f7-499c-8ddd-8d9df3a2db3d.filesusr.com/ugd/9b9c26_b458d151a429438a9c6d5419620f35e8.pdf?index=trueIn PDF document text
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_be045ad832a94893abd5d7761712d535.pdf?index=trueIn PDF document text
    • http://radawewivilu.epizy.com/fabikokuberaxiwevalezegix.pdfIn PDF document text
    • http://rusozetowozo.epizy.com/academic_committee_report.pdfIn PDF document text
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_3a92c8ea0c26443cbdf036619b6a169d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wixanarer/company_introduction_letter_format.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/pisamaxirokiveloj.pdfIn PDF document text
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_c89ea5ecd5f945d482e0f9ddbc76a5c5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuses/67059582149.pdfIn PDF document text
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_a07c1b5b3450444b864fd9c047ec018a.pdf?index=trueIn PDF document text
    • https://a9750898-a066-404d-a796-54a2f5ad13bb.filesusr.com/ugd/60231a_ab543e85bad34b12a778ee0a89355ab7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/setikizo/fewulogapetemab.pdfIn PDF document text
    • http://novosumagib.epizy.com/vocational_english_for_nursing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81ae931d-6770-4749-afc2-c227a8df6e17/lanefopawis.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/29390891257.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ae5bc54-adda-44c3-8936-83ce6a74602d/97155655796.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C72 5732 bytes
SHA-256: d027e74b468e0dfe70eb5f51c286011387446292a6a703f6b9e258b2db5a658c
font_01_sfnt_off00012fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCE 10800 bytes
SHA-256: f77fd07ab1d45adb57321017272c6b0d4fa37b3377bd91ef26f7edbb8d95494f

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