Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f544d81783ef5b…

MALICIOUS

PDF

85.6 KB Created: 2021-06-06 18:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 99c494af2cc3932e064e3f9a772e1818 SHA-1: ae4a57da9da1e91909a13daf65bc1ffa4b9ad197 SHA-256: 39f544d81783ef5b1f13a54cb65cca7a074fcd8c45101457f5598176e4439c34
186 Risk Score

Malware Insights

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

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 lure. The document body, though heavily obfuscated, appears to be related to a summary, potentially to disguise the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crysiq.ru/pbw?utm_term=thank+you+ma%2527am+summary+sparknotes PDF link annotation
    • https://faraguwu.weebly.com/uploads/1/3/0/9/130969294/a260ff36f34.pdfIn PDF document text
    • https://bazewubudib.weebly.com/uploads/1/3/4/7/134731154/lixiwuvukafojivibanu.pdfIn PDF document text
    • https://zupevojug.weebly.com/uploads/1/3/0/7/130740492/8c3bf3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465003/normal_606743869a753.pdfIn PDF document text
    • https://fapixuguxoga.weebly.com/uploads/1/3/1/0/131070829/1395393.pdfIn PDF document text
    • https://botiwugagow.weebly.com/uploads/1/3/1/8/131872238/fosuwuboze.pdfIn PDF document text
    • https://boxotegiperofog.weebly.com/uploads/1/3/1/3/131398000/4d3d90330c6f9b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485580/normal_602d63089615c.pdfIn PDF document text
    • https://wotowabe.weebly.com/uploads/1/3/4/6/134688823/budilibeza-fuvivodarumezar.pdfIn PDF document text
    • https://sijodeteketede.weebly.com/uploads/1/3/4/4/134486162/8990686.pdfIn PDF document text
    • https://kaxukododeregoz.weebly.com/uploads/1/3/0/9/130969338/8fd0bdd71921b.pdfIn PDF document text
    • https://matopudalerem.weebly.com/uploads/1/3/5/3/135318895/3087831.pdfIn PDF document text
    • https://rojikejasixut.weebly.com/uploads/1/3/2/6/132682083/6843483.pdfIn PDF document text
    • https://gokejaxax.weebly.com/uploads/1/3/6/0/136056436/7874586.pdfIn PDF document text
    • https://nurifekuti.weebly.com/uploads/1/3/4/5/134516663/9913698.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427544/normal_604981e6d8aee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gorixose.pbworks.com/f/83770141376.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/w/file/fetch/144411741/fubebomeperoxavapitib.pdfIn PDF document text
    • http://zepupifob.pbworks.com/w/file/fetch/144627543/40341544887.pdfIn PDF document text
    • http://wixugigir.pbworks.com/f/zejilaletado.pdfIn PDF document text
    • http://xetuduju.pbworks.com/w/file/fetch/144534609/how_to_get_out_of_a_planet_fitness_contract.pdfIn PDF document text
    • http://guronavageba.pbworks.com/w/file/fetch/144515391/sixibexakisawipisatozulel.pdfIn PDF document text
    • http://xobapotowi.pbworks.com/f/35780438339.pdfIn PDF document text
    • http://mutoteja.pbworks.com/f/58561756097.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_off00010dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAB 5176 bytes
SHA-256: 24401862d64a09a6f4cbcf3454cc93155a3853cc398da89f54d24145f1f4a0d9
font_01_sfnt_off00011f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2A 11852 bytes
SHA-256: 7b42149efd1cda1a056b8c7f0c031f889323aedf453851aeece8d44a6450d0a6