Malicious PDF — malware analysis report

Static analysis result for SHA-256 c87bd60fdc4036ed…

MALICIOUS

PDF

80.6 KB Created: 2021-04-04 22:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9b8542f013772cd68fd04d12f329d27b SHA-1: 12130904a694b32adaaca5e0b5ebd62eb479694e SHA-256: c87bd60fdc4036ed97caf56b346b655727860126d549c985d1273e9e75971eb4
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://seumenha.ru/wix?keyword=electron+configuration+test+review+answers PDF link annotation
    • https://cdn.sqhk.co/keropolor/iegjkji/42056435270.pdfIn PDF document text
    • https://cdn.sqhk.co/fofateze/ihxGwnB/10347727436.pdfIn PDF document text
    • https://cdn.sqhk.co/powurejur/igRhfCb/bukodetoxaxazefotubasofam.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxumududu/ajfUgcD/larabejilaxigivip.pdfIn PDF document text
    • https://zorivaleguzovul.weebly.com/uploads/1/3/4/5/134596353/6c7d4181.pdfIn PDF document text
    • https://cdn.sqhk.co/lubometusoz/hRfjdb8/gta_5_modding_install_2019.pdfIn PDF document text
    • https://lefizedut.weebly.com/uploads/1/3/2/6/132681647/047a98c40b.pdfIn PDF document text
    • https://tatedamemod.weebly.com/uploads/1/3/0/7/130739791/bavikafuso-jexikigij.pdfIn PDF document text
    • https://lerofazoneku.weebly.com/uploads/1/3/5/3/135314691/7944930.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/a534e13a-38e4-4f74-89ee-d7372d673787/mulukanov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad2ca707-7ac9-4130-9ebf-a49a0f2f248b/what_does_the_tree_of_life_tattoo_symbolize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a445d82c-6dad-4529-b030-f7952a325b84/fulan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35a2d1b2-6441-4640-9d2b-659dd8446b51/73931047294.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba191ffa-fa0f-4cae-9332-47658f82f7fa/arduino_uno_circuit_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcad8458-0c3d-41c5-ad31-12a3d48c70fd/85217986628.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/983fbfa4-83f0-4964-aafd-f0956146b71d/heat_n_glo_fireplace_insert.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d1458ba-374b-4b8c-ae7e-3a1343ea1614/fanefiwikufidomi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1f3950c-2119-42bf-b6ce-b5b8fa854f80/45235925117.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83e7e172-a1d0-4e30-b786-3fdbc0ee88a6/ancient_greece_olympics_information.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_off0000e529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE529 5156 bytes
SHA-256: 50adfd63a360e69b8b21c1887ff4704198666f1b7c09d41eae3267b4b1fca24c
font_01_sfnt_off0000f6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E0 11688 bytes
SHA-256: aaf84d865a6f0b00c2aa07aca99463cbf1fe9191ad36c5d94a0faeaf69f5eb5b
font_02_sfnt_off00011f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0F 16288 bytes
SHA-256: 640bd3bbf1cbc1881bebdb366c3def348bdee7395f391602e797cbc5d39a1bda

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