Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7cd0d6485ec57e…

MALICIOUS

PDF

89.6 KB Created: 2020-11-11 00:49:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: fe699823269ee475900e61bbd85950a6 SHA-1: db18bdb9acb199e17af5d1644ffa2f533940d5d1 SHA-256: 5b7cd0d6485ec57ec5e5ea04e7801a1bd517e294544175e6c907c560e323c376
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 0.9997

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
  • 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/strik?keyword=pre+ap+chemistry+quiz PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385020/normal_5fa3e52f8daec.pdfIn PDF document text
    • https://pevugubak.weebly.com/uploads/1/3/2/7/132740457/9a70ccf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390641/normal_5f9b13a80cef3.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/8835d1ac-1ecd-44c2-9bae-0a4e28898f76/falesuzojoliwozigotazajog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15bfa15d-0088-40a9-8c45-30c4278370bf/37952759624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/554e4799-93ea-4790-acb5-8e9b934e4464/98228074078.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1415ce5-a30e-42dd-953f-5575629ee616/80810208616.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f58581a-d3ef-4846-9d2d-0e090652c44e/dopomibovazof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6dca2dd-ce79-416e-a856-05bacaa60ec4/south_kihei_movie_theaters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d77239e0-1ba6-4dbd-a997-44af033c315c/grand_river_folk_arts_society.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d71270d-b34f-4aa1-ac8f-de8dc80adfa3/38669433521.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1a20cbd-e0ec-4a8d-8a07-bb64a0662651/remapomogabikefilit.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10589 5420 bytes
SHA-256: bf998a118a5d7bdd159afc0a7077fb6af0680b6e8adf052d19ff708b08438f4f
font_01_sfnt_off000117e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E5 12508 bytes
SHA-256: 5b4246ef1135441ab58d93563dfce9802d707e05aba64359f4da14a767a7de70
font_02_sfnt_off000140b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140B8 16648 bytes
SHA-256: dd513127de2a7a7f576ca1384e0109949125858a796568e113bca50aa5e097b0

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