Malicious PDF — malware analysis report

Static analysis result for SHA-256 48473998a3acaa2a…

MALICIOUS

PDF

60.1 KB Created: 2020-12-06 11:23:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 7b1be4226c246f17906dd87a675357e9 SHA-1: 9bd4d8af00e8384547527247363868d70b45c840 SHA-256: 48473998a3acaa2a18fd220206ac1c9bb81165c619022ecc4ec9655c0700ed09
156 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. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://trafftec.ru/strik?utm_term=nc+teacher+evaluations PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4392668/normal_5fc62c263b150.pdfIn PDF document text
    • https://wefapewirevuvik.weebly.com/uploads/1/3/4/6/134667644/7883437.pdfIn PDF document text
    • https://bivupiduxod.weebly.com/uploads/1/3/4/6/134664268/suzopivibozeruzovovi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454168/normal_5fa814288fabd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421639/normal_5f9fd4318aaea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416919/normal_5f96387f27611.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375095/normal_5fc263590ca1d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e82698a2-fe10-462c-8ace-3044d2a54998/86487068271.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd142e0184ca2f8d55d0f0/1606226999956/graphing_absolute_value_equations_worksheet_algebra_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4798b37-f034-48c9-ad7b-9be954dbe5aa/what_is_supporting_sentence_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7192526f-8ee0-4c46-ac9e-45034310c3db/petojuduruwevasage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/148b4a62-5110-4acc-bb45-9d5e6712190e/50069910426.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_off0000b0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E1 4916 bytes
SHA-256: ccf42c3d6e526ac32c3560190ed9e530428aec6a01a7638445a181da642ced75
font_01_sfnt_off0000c19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC19D 10128 bytes
SHA-256: 2befae77b79aee1c9f32759d5b1b20977c2f5a1159b57c6daf6799633bb8f02a

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