Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5fd54e43a85a2e5…

MALICIOUS

PDF

87.1 KB Created: 2021-02-28 16:55:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: bf271d3d68ed38a5bd14d9e8bc1ce3c2 SHA-1: c654bd15fad17f92c8ae1d6c8cb23829bab9c05a SHA-256: f5fd54e43a85a2e59671f8cb3dac9c2beb4a6c43a2611b235ac4fbf5e31a1bc8
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The heuristic 'SE_CLICKFIX' suggests the document may also contain instructions to trick users into executing commands, potentially to bypass macro restrictions and download further payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://baarspo.ru/strik?utm_term=why+won%2527t+my+hp+officejet+pro+8620+print PDF link annotation
    • http://lonumawewexupo.22web.org/pages_comic_book_script_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366316/normal_5ffb69657d0c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368762/normal_6039980c0e0e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426819/normal_5fe316386c47f.pdfIn PDF document text
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/rebewaluk_ridovib_doruvijarepuxid.pdfIn PDF document text
    • https://vujezogovi.weebly.com/uploads/1/3/5/3/135348950/vofiwagatejabe.pdfIn PDF document text
    • https://porojole.weebly.com/uploads/1/3/4/4/134462866/nopuminudo.pdfIn PDF document text
    • https://gomamuna.weebly.com/uploads/1/3/5/3/135304292/fesipa.pdfIn PDF document text
    • https://vowagogo.weebly.com/uploads/1/3/5/3/135307183/6103532.pdfIn PDF document text
    • https://kobigaxa.weebly.com/uploads/1/3/3/9/133997295/moxusod.pdfIn PDF document text
    • https://dipabuxirakilat.weebly.com/uploads/1/3/1/0/131071076/d5bc75.pdfIn PDF document text
    • https://nitegira.weebly.com/uploads/1/3/1/0/131071289/basal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386080/normal_5fed267c3abdb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gekunulew.epizy.com/tratado_elemental_de_derecho_romano_petit_eugene.pdfIn PDF document text
    • http://xafegewiko.epizy.com/aparichitudu_telugu_video_songs.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_off00011531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11531 5776 bytes
SHA-256: 4ba3633325675343410d64a60f52f0c28404b40929546d855b92ff55a8b0fd7e
font_01_sfnt_off000128ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EE 11160 bytes
SHA-256: c079fcb8a5d5a130c9bbb80e25bb5a1ffc1d87cdb8ae6c614842517268fe251e

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