Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b52dea19b8378c…

MALICIOUS

PDF

72.3 KB Created: 2020-11-27 20:53:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4fc888255e7f536995b04123401cd745 SHA-1: 152da3d79479e1f9fbd2c0b0f8e04d321e7bc01d SHA-256: 21b52dea19b8378c73603baf140b04362307e3b97b2bb7ee2312da93624b3f94
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://traffset.ru/strik?utm_term=middle+east+and+north+africa+map+vector PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417528/normal_5f9b56dc24b3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378425/normal_5f90a092e05da.pdfIn PDF document text
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/mezuber.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480182/normal_5fac5f3810385.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445729/normal_5fa3216931dd2.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/13f03418-5220-4fed-be30-221a194f2c54/18012520741.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28eb9a62-8fc7-4f94-91e1-1d556407c644/iglesia_ni_cristo.blogspot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bd3a7f4-be81-4a3d-8063-dd6ef2f02175/moon_chosen_series_pc_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65699ce4-c91b-4380-8b5f-199b6258d17a/dazadolakawes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/025a3f9b-48de-4a24-a73c-e65c2c9ea826/kedej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34ed9511-800b-486f-89b0-d4db0215040f/gamixewoxajarino.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/ispad_2018_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee257b76-774d-480f-8a48-e32c7a86ac16/alter_ego_5_cahier_d_exercices.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/392b1c1d-71eb-4480-b56d-471f92dd0378/sozevonigigudatar.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/24699671861.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4f1576c-2583-4249-89fc-81bb16dbd6ef/fobiwevefujoranevaleluzez.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_off0000dcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFE 5460 bytes
SHA-256: c9dfdcbb4e6c13e52d2a5e0fe07765ab78d435aa63ac54d7ca9941f6b58e1f6d
font_01_sfnt_off0000ef7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7D 10840 bytes
SHA-256: 16fe692d1e7260033297845918b27c6077bb8990a7e6589ab7e42c657ec787dc

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