Malicious PDF — malware analysis report

Static analysis result for SHA-256 254cf5548b44733c…

MALICIOUS

PDF

72.6 KB Created: 2021-06-05 09:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c1e2ac21bcd129728cbd2a4896d00191 SHA-1: e9e8c8bcf5209706d590e5a129293b7ba4a177da SHA-256: 254cf5548b44733c378ce8957c7c7c745a7364864d8ce46dc8af67a8d1cff4f4
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dugedepap.ru/123?utm_term=emotional+atyachar+video PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449627/normal_5fd68d5a0fa1c.pdfIn PDF document text
    • https://budamasut.weebly.com/uploads/1/3/4/9/134903336/786887.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470028/normal_5fd9b60f767d7.pdfIn PDF document text
    • https://wuviwozerax.weebly.com/uploads/1/3/4/2/134266003/rorokaxoxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369307/normal_600abc52f3e83.pdfIn PDF document text
    • https://mirepabokotixiz.weebly.com/uploads/1/3/2/7/132712407/liripajilebug.pdfIn PDF document text
    • https://niwurakoj.weebly.com/uploads/1/3/4/5/134588258/zotok.pdfIn PDF document text
    • https://riginujer.weebly.com/uploads/1/3/2/6/132695799/6355093.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446289/normal_606e44f9e1949.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411691/normal_6038cb45758f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449602/normal_606c441adda54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472773/normal_5fd907511be1c.pdfIn PDF document text
    • https://romasagato.weebly.com/uploads/1/3/4/7/134723475/4779153.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367300/normal_5ffac7972d84a.pdfIn PDF document text
    • https://jirilerimu.weebly.com/uploads/1/3/5/9/135967849/gufiniwubof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390324/normal_601c5c10deb37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402737/normal_604cb8d78337b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://betosaxugawi.pbworks.com/w/file/fetch/144455235/aki_ola_series_core_mathematics.pdfIn PDF document text
    • http://pozapagula.pbworks.com/f/jedekominojedujepido.pdfIn PDF document text
    • http://wejojixi.pbworks.com/f/realidades_1_capitulo_7a_actividad_11_answers.pdfIn PDF document text
    • http://mivegaz.pbworks.com/f/jitibetefud.pdfIn PDF document text
    • http://jevibufile.pbworks.com/f/aoac._1990._official_methods_of_analysis._15th_ed._usa.pdfIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144415359/4963700852.pdfIn PDF document text
    • http://zeratuwolima.pbworks.com/f/38136280949.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_off0000dcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC2 5120 bytes
SHA-256: b3e370dab3397f9c5693d5f53bae5696bc96d8252a869fb45f7f7ca37c74883f
font_01_sfnt_off0000ee09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE09 11484 bytes
SHA-256: 62b360c57b3dec1ec3da3eb55698d4e8e4319394b120f205e85b542e6be6f81e