Malicious PDF — malware analysis report

Static analysis result for SHA-256 2963ea054612044b…

MALICIOUS

PDF

73.9 KB Created: 2021-03-20 15:40:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f174af2191f9d1da46ef11aa3d65d7c5 SHA-1: f15d5bd776092aeaef844b2ab67a3770aa4c9a8b SHA-256: 2963ea054612044b5d03a448ef9c7c9bea000979a5ebeae4130b7486b16d8984
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic to drive traffic to potentially malicious sites. The document body, though heavily obfuscated, contains keywords related to 'emotional development in adolescence pdf' and the wkhtmltopdf application, which is often used to generate PDFs from web content, further supporting the link farm hypothesis.

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://botokaw.ru/award?keyword=emotional+development+in+adolescence+pdf PDF link annotation
    • http://vugaganopofom.mypressonline.com/52543398872.pdfIn PDF document text
    • http://juvizex.sportsontheweb.net/best_class_for_a_warforged_5e.pdfIn PDF document text
    • http://pawusewi.sportsontheweb.net/ciclos_circadianos_en_plantas.pdfIn PDF document text
    • https://tovimovu.weebly.com/uploads/1/3/0/9/130969206/2747501.pdfIn PDF document text
    • http://rabemedexisubis.mygamesonline.org/libralisme_politique_rawls.pdfIn PDF document text
    • http://laluwaraselolar.mywebcommunity.org/where_is_samsung_a51_manufactured.pdfIn PDF document text
    • https://nidedijuba.weebly.com/uploads/1/3/0/8/130814831/2110115.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485704/normal_60337137ebd9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385009/normal_5fd67d560101a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_17fd161206c943ccafc48e3012c92e31.pdf?index=trueIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_ea59a0cf16074eb4b4e87bd7b5256ff3.pdf?index=trueIn PDF document text
    • http://donijexufenu.onlinewebshop.net/english_dictionary_telugu_meaning.pdfIn PDF document text
    • http://nelivizazepafo.epizy.com/cantor_s_theorem.pdfIn PDF document text
    • http://riwugiboturom.epizy.com/vadufop.pdfIn PDF document text
    • https://76a725e8-946c-4ae9-9249-cda469d35108.filesusr.com/ugd/83c8cc_76fb4b6afed54505ae80c85615a84646.pdf?index=trueIn 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_off0000e59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59A 5220 bytes
SHA-256: 8f8b8178ad11fa6b2065ffeea6b635724cf34e9ba99f6489273125433eed23ac
font_01_sfnt_off0000f75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75A 10360 bytes
SHA-256: 0e34e4326eb1fa21233141282b03c79203495a53f366e8d49c00b9de0d0f106f

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