Malicious PDF — malware analysis report

Static analysis result for SHA-256 2977d781e69eb10a…

MALICIOUS

PDF

69.8 KB Created: 2021-02-17 00:49:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3b1ebac7c6efe1142cf2ec8ad22679b7 SHA-1: 0add609db89c531907781b2a583a787488d6b698 SHA-256: 2977d781e69eb10ab27be48410c0acd180e7024604e13ce2504e587de633e62e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or content redirection scheme.

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://leonvi.ru/strik?utm_term=las+mejores+frases+del+caballero+de+la+armadura+oxidada PDF link annotation
    • https://bojubuloxobepi.weebly.com/uploads/1/3/0/9/130969884/6873567.pdfIn PDF document text
    • http://gouliwer.online/year_of_the_rabbitkdlgk.pdfIn PDF document text
    • https://velazidolis.weebly.com/uploads/1/3/0/9/130969689/kazibasutidot.pdfIn PDF document text
    • https://sobuxiba.weebly.com/uploads/1/3/4/8/134867950/be8734.pdfIn PDF document text
    • http://didavixakodix.22web.org/guideline_401k_address.pdfIn PDF document text
    • https://jofanota.weebly.com/uploads/1/3/2/3/132302765/678ad2091.pdfIn PDF document text
    • http://mnogoturov.com/westworld_season_2_mp439qtd.pdfIn PDF document text
    • http://moreprodukti.com/circle_parts_worksheet_answers5fl4z.pdfIn PDF document text
    • https://xarudaxukisa.weebly.com/uploads/1/3/4/0/134018653/5210645.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505159/normal_5fea36187d239.pdfIn PDF document text
    • http://bestunew.xyz/rufujulunx2lh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446931/normal_6023da907eb12.pdfIn PDF document text
    • http://torgservis-rus.ru/agartha_1_yoruba_movieafspo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dinisevorodak.epizy.com/7823723804.pdfIn PDF document text
    • http://wexadelovatapox.rf.gd/1296664327.pdfIn PDF document text
    • http://natexekazedap.epizy.com/bostitch_miii_floor_stapler_manual.pdfIn PDF document text
    • http://vepilezora.epizy.com/44472068350.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_off0000d0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A8 5392 bytes
SHA-256: 8b31598e962bb78fccb8b8d74f739ca91e5d9de5b631e6fed27acf71c9b3e00b
font_01_sfnt_off0000e2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F0 11204 bytes
SHA-256: af563274b820a95a3da91d57d529c9e54d85985761d444d7302f6f446aa13709

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