Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c65d513d05f7d3…

MALICIOUS

PDF

73.2 KB Created: 2021-02-16 19:21:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8f97c2fe164a275a96d4b47dda1d56a0 SHA-1: e87e5bbaeed1042d0d5a913a987f135841a7c11b SHA-256: 35c65d513d05f7d33edb7955b7b3095f96559a3fd1e750aa525e8026a1d7a34b
186 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 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=journeys+out+of+the+body PDF link annotation
    • https://bejolikide.weebly.com/uploads/1/3/1/4/131437094/febawiz.pdfIn PDF document text
    • http://witaseru.iblogger.org/17214068046.pdfIn PDF document text
    • https://wunovolal.weebly.com/uploads/1/3/5/3/135311751/zusekibif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404964/normal_5fced6c47e486.pdfIn PDF document text
    • https://lupawepenotude.weebly.com/uploads/1/3/1/6/131606523/2185548.pdfIn PDF document text
    • http://papotupeti.iblogger.org/23893141008.pdfIn PDF document text
    • http://toppiksnack.xyz/social_awareness_program_reportjkd38.pdfIn PDF document text
    • https://sazotavivi.weebly.com/uploads/1/3/1/1/131164406/7c5086284c5.pdfIn PDF document text
    • https://bijejumutitin.weebly.com/uploads/1/3/1/4/131454352/jodimadisiwuken_zukonelafo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ritofeli.epizy.com/barcode_generator_ean_13.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/double_bass_trio_sheet_music.pdfIn PDF document text
    • http://gonurorirezode.epizy.com/rufoxufuvetarewesuminoni.pdfIn PDF document text
    • http://zekakodususebu.epizy.com/19227485418.pdfIn PDF document text
    • http://bozalusi.epizy.com/72647667058.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_off0000e314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE314 4984 bytes
SHA-256: b843eeeaa0c793c43f2d3541ea6305a01c6a11148b85ff1165163f93f7164274
font_01_sfnt_off0000f407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF407 11024 bytes
SHA-256: fcee0975613cc71a6e8ab62b73b487d8c98d8782123f6d104d4e16ac28365030

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