Malicious PDF — malware analysis report

Static analysis result for SHA-256 59e2a2ced4b98513…

MALICIOUS

PDF

72.9 KB Created: 2021-03-04 10:59:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: aedc77d506cbb744d79eb5c919cd7e8e SHA-1: 92819daab127b34a3ca03029f5a8b35a48ef3734 SHA-256: 59e2a2ced4b98513022bcfd38d7e25200b892420d5fb6f6ea473419ebcdb5f7d
134 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded URLs, one of which points to a link farm on disposable hosting, suggesting a phishing or redirection scheme. The document body, though heavily obfuscated, contains text related to 'interview questions and answers', which serves as a lure to encourage user interaction with the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jacksth.ru/award?keyword=mvc+5+interview+questions+and+answers+pdf PDF link annotation
    • http://dazenad.iblogger.org/rifazelamivabexoviralenoj.pdfIn PDF document text
    • http://palaxofivuleduj.medianewsonline.com/my_passport_ultra_4tb_price.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527345/normal_5fc7dc34c83f6.pdfIn PDF document text
    • http://jujovobima.getenjoyment.net/does_procreate_pocket_work_on_ipad.pdfIn PDF document text
    • https://cdn.sqhk.co/dewavasese/p0jeVre/97613462264.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461219/normal_5fd8d04e2a940.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369142/normal_5fd667bd1e1cd.pdfIn PDF document text
    • https://cdn.sqhk.co/gitaligido/2518FQk/49721203183.pdfIn PDF document text
    • https://levibaxa.weebly.com/uploads/1/3/1/4/131408620/9c8bdee5b29.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://losalevova.epizy.com/21665371676.pdfIn PDF document text
    • http://wilixafex.epizy.com/davalegoravoto.pdfIn PDF document text
    • http://fefezaw.rf.gd/46472236947.pdfIn PDF document text
    • http://demuwesax.epizy.com/6155838377.pdfIn PDF document text
    • http://delusasad.rf.gd/kiniponepitoxal.pdfIn PDF document text
    • http://zisafaziga.epizy.com/certified_ethical_hacking_study_guide.pdfIn PDF document text
    • http://bawawajabatura.epizy.com/94858735567.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_off0000e0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AA 5524 bytes
SHA-256: 73220a1ef82eeeee90ca674e2395456433e539d6db2e3ff65b119e8f8d68c7a5
font_01_sfnt_off0000f3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AD 10276 bytes
SHA-256: 2057612589ad0b1e1332100bb32aaeace17a29a54075ec7fb6d2149cd4aa35e5

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