Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a4628f39aabe6fc…

MALICIOUS

PDF

74.7 KB Created: 2021-03-19 22:10:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3f7fab2826ea35dab6ea898850018161 SHA-1: 52fb2b1b1c05e70c64c9cf09f0f83cf719ecf082 SHA-256: 3a4628f39aabe6fce7d28c8694fcbe0a54ef26c379a8951e8d90d0ebf86f9046
116 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a QR-code lure. The file embeds external URLs that direct users to attacker-controlled resources. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=practice+bank+integrated+mathematics+3+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4425910/normal_5ffaba0a0a67e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417122/normal_60364dbf67f68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403428/normal_603cea77e7512.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487618/normal_60496a75bad0e.pdfIn PDF document text
    • https://lukuxafibufogi.weebly.com/uploads/1/3/5/4/135400428/buvebiguz.pdfIn PDF document text
    • https://vumiluvitut.weebly.com/uploads/1/3/2/6/132696113/pegabezapibulakozib.pdfIn PDF document text
    • https://diwuxofemuji.weebly.com/uploads/1/3/1/4/131407179/votut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467277/normal_5ff0acd771717.pdfIn PDF document text
    • https://lijanitog.weebly.com/uploads/1/3/5/3/135309202/rovobov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/ios_app_store_review_guidelines.pdfIn PDF document text
    • http://vubedarav.epizy.com/9864732020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dc3e987-f9e8-4d81-9981-4dd63c43fa5e/nazm_hikmet_hayat_ksa_iiri.pdfIn PDF document text
    • http://xakafoboveje.rf.gd/40428018659.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/geotechnical_site_investigation_report_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/2486202443.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb758d42-4ff5-434e-bd0c-287b89d45a88/46008231277.pdfIn PDF document text
    • http://xezabesazigida.epizy.com/what_is_functional_programming_example.pdfIn PDF document text
    • http://gevusival.epizy.com/gauntlet_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f528a26-393e-4775-b009-68a03f7562f0/60495271631.pdfIn PDF document text
    • https://s3.amazonaws.com/subopukomanaw/6479010840.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/adblock_plus_edge_android.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_off0000e231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE231 5784 bytes
SHA-256: fb9beba5ed20c6e35b1e103888086bc6a6731913bf5938862e4b3b3a38b6cf5b
font_01_sfnt_off0000f5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C6 11428 bytes
SHA-256: ab67e3b41cccbd4104411ed17b8b52d2c05f63651ec1634ae7947433a56255cf

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