Malicious PDF — malware analysis report

Static analysis result for SHA-256 81838b1a483bda01…

MALICIOUS

PDF

72.6 KB Created: 2020-11-25 12:27:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 68b763cb4cd575be8b67bc327bb2019d SHA-1: 6dfaeca0f014e1d515b2cfafecc7ee656bca86db SHA-256: 81838b1a483bda012577f89ac2740c974b3bedb1c357bd4aa00169d60aaec745
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 0.9998

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://traffnew.ru/123?utm_term=van+der+weyden+madonna+and+child PDF link annotation
    • https://jenititufevi.weebly.com/uploads/1/3/4/5/134595561/568333.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465557/normal_5fb2ed3a006fd.pdfIn PDF document text
    • https://solovetimu.weebly.com/uploads/1/3/4/8/134879252/wejopegufado_pifov_dedunukigi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370740/normal_5f8ed179a9127.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454430/normal_5fbd5a948db40.pdfIn PDF document text
    • https://lusimijibujadex.weebly.com/uploads/1/3/4/6/134677052/lozotoko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370090/normal_5fa5bd7569c1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493876/normal_5fab169bb0333.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423443/normal_5fb90eae4c8de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381081/normal_5fbb4dc221cce.pdfIn PDF document text
    • https://gonoloxezejuje.weebly.com/uploads/1/3/1/4/131410007/493437.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/45f803a6-763b-43f3-8c1f-ec1457629a19/sensores_capacitivos_como_funcionan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdf6b173-0136-4e1e-940a-06186bfc670f/world_mythology_donna_rosenberg.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/bazoripamuxepazajik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ea0393e-90c6-4a03-b6d9-2e4dc913f971/26295383093.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/england_league_one_full_form_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df17ed56-b764-4adf-9fd5-5bf16d43bb83/investigation_11_transpiration_pre_lab_answers.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD9 5160 bytes
SHA-256: 1f253009e3a4e64938ea126f0bc6909ffcad0d978386994f5d67f5ffdd79a2ce
font_01_sfnt_off0000ee57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE57 11408 bytes
SHA-256: cc8ae4a4bcdae176c6bf52640706692813dc5caaee29826985703297b6e1668e

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