Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef3ac298b96689a3…

MALICIOUS

PDF

70.7 KB Created: 2021-02-25 14:41:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d3db909b4ffdaab7f91300abb77a7f14 SHA-1: 3cfd8e9500c5eb47c97d29a5c4f2cd040e86e1c9 SHA-256: ef3ac298b96689a3bae59ccf00d91f744f3439d62b169eb26b83d9ae8b02857b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://bologen.ru/strik?utm_term=sv650+repair+manual+pdf PDF link annotation
    • https://miluxeto.weebly.com/uploads/1/3/5/3/135326788/4777103.pdfIn PDF document text
    • http://roskycnmx.com/uc_browser_2019_apkpurerb3j8.pdfIn PDF document text
    • http://mutujejeturuduf.medianewsonline.com/39341511483.pdfIn PDF document text
    • http://jedilinosur.mywebcommunity.org/65554365044.pdfIn PDF document text
    • http://dawexefif.getenjoyment.net/12335710139.pdfIn PDF document text
    • https://pamaxorakumi.weebly.com/uploads/1/3/4/0/134019068/gamimulikuguvejo.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/why_was_the_government_of_india_act_1935_important_7_marks.pdfIn PDF document text
    • http://fupemagis.mywebcommunity.org/los_nombres_de_dios_en_la_biblia_catolica.pdfIn PDF document text
    • http://parkingtest.xyz/who_are_the_characters_in_gone_with_the_wind822d9.pdfIn PDF document text
    • https://gosabotef.weebly.com/uploads/1/3/4/3/134332229/lipelageda.pdfIn PDF document text
    • http://zipubezexupoka.mywebcommunity.org/2018_first_aid.pdfIn PDF document text
    • http://fesotisifofil.mygamesonline.org/first_grade_math_standards_cheat_sheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jokosen.atwebpages.com/wotavofekuka.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_off0000d49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49A 5592 bytes
SHA-256: 4a4418ceafded149a0ba0fb046311eaa85d1b2fc248a51a7220a0d0aa6e7d295
font_01_sfnt_off0000e788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE788 11388 bytes
SHA-256: 128831c001cd2838b35b63e2c6881fb7ed3af8a1910c4c4b82a1afc8b0a23c14