Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a3e6b1bc9c6b51…

MALICIOUS

PDF

73.6 KB Created: 2021-02-26 10:48:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 573bdd23a289de835b69f2b9846d687e SHA-1: 167d26f5d2fdec14a21592e294720cc62043dee3 SHA-256: a3a3e6b1bc9c6b51456135d0ff7bcf5fc24c169711dd6866b552bed9c4620137
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many pointing to disposable domains and hosted on services like S3, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://soxebez.ru/123?utm_term=troy+bilt+horse+mower+deck+diagram PDF link annotation
    • https://xowetigebunagu.weebly.com/uploads/1/3/1/6/131637365/timodowebaj.pdfIn PDF document text
    • https://cdn.sqhk.co/kuxazigozo/hejihay/kidudigilewisiravamis.pdfIn PDF document text
    • https://cdn.sqhk.co/foxoxaze/02HOZhg/xepuwulalolumegu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366375/normal_5fd6db528ed32.pdfIn PDF document text
    • https://bijawodit.weebly.com/uploads/1/3/4/8/134883407/8684620.pdfIn PDF document text
    • https://rovorakule.weebly.com/uploads/1/3/4/7/134774255/kesorisaposewikevab.pdfIn PDF document text
    • https://wegebumerovoni.weebly.com/uploads/1/3/5/3/135387929/5548872.pdfIn PDF document text
    • https://cdn.sqhk.co/mepawoworu/UoxghTw/modern_sniper_java_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jezaziritav/pif3ihx/kovamebegofaxofinega.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/ePigiaN/lightroom_app_download_for_windows_10.pdfIn PDF document text
    • http://micrometer25bill.site/tiwusumerekidrwgeu.pdfIn PDF document text
    • https://gevobudijopu.weebly.com/uploads/1/3/4/8/134880408/7731103.pdfIn PDF document text
    • https://merebidoso.weebly.com/uploads/1/3/4/3/134344951/1321545.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mixanaz/tibutejuximuga.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/48467280519.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/3d_column_chart_excel_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/finding_critical_values_calculus_worksheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD741 5384 bytes
SHA-256: 8b75f015a7dfd542bf9c1f0e98659ee9dc4c3f5755711dcb904d34ea812004c6
font_01_sfnt_off0000e9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A8 9648 bytes
SHA-256: d00faa8e8b0ebc80d863c1739d4b1d5d4d0e839885687327626e01a8350f3ed6
font_02_sfnt_off00010aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAE 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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