Malicious PDF — malware analysis report

Static analysis result for SHA-256 939fee54dd4631d8…

MALICIOUS

PDF

65.9 KB Created: 2021-01-24 10:29:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 21360e26966e137a37f96d0cef86f572 SHA-1: e4444002995435bc7124b66e11458e6b83337a2b SHA-256: 939fee54dd4631d8f458d203370d15d54624a375653f8606860f049089ff62d0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external URIs, including one pointing to 'baarspo.ru', suggesting it's designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to contain metadata related to 'wkhtmltopdf' and academic content, likely a lure to disguise its malicious intent. No scripts were extracted, but the PDF structure and external links strongly indicate it's used for distributing malware or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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/aws?utm_term=ap+physics+gravity+force+lab+answers PDF link annotation
    • https://site-1178803.mozfiles.com/files/1178803/rosavagamenudevidemegijeb.pdfIn PDF document text
    • https://site-1176004.mozfiles.com/files/1176004/86136226245.pdfIn PDF document text
    • https://jivetekerujurar.weebly.com/uploads/1/3/2/6/132695216/rowikepevo.pdfIn PDF document text
    • https://piziwola.weebly.com/uploads/1/3/1/3/131382430/191666.pdfIn PDF document text
    • http://nutapobo.iblogger.org/powerpoint_theme_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470389/normal_60065eb3a3f0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449779/normal_5fe79ec63e44d.pdfIn PDF document text
    • https://gavizixuf.weebly.com/uploads/1/3/5/3/135334805/2514718.pdfIn PDF document text
    • http://boviriso.22web.org/vewopojixewulobepamopoma.pdfIn PDF document text
    • https://cdn.sqhk.co/lokijuzim/hjcfYvj/zombie_x_apocalypse_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462036/normal_6007dbeab967a.pdfIn PDF document text
    • https://site-1172264.mozfiles.com/files/1172264/nubitojafubi.pdfIn PDF document text
    • https://dapoxegimore.weebly.com/uploads/1/3/0/9/130969679/juxirufopufe_lutud.pdfIn PDF document text
    • https://cdn.sqhk.co/zisujidixa/f14Ncby/63266122761.pdfIn PDF document text
    • http://xawinagolagiju.iblogger.org/airplay_android_phone.pdfIn PDF document text
    • https://site-1178602.mozfiles.com/files/1178602/6592463284.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404124/normal_5fe6be7b6d9b6.pdfIn PDF document text
    • https://rabuwamefikulo.weebly.com/uploads/1/3/1/3/131398373/redapa-losepirij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://volajigatume.epizy.com/vubomekolotamazenod.pdfIn PDF document text
    • http://nalakakowim.epizy.com/wimbledon_movie_parents_guide.pdfIn PDF document text
    • http://gotenekopibijo.epizy.com/69433310226.pdfIn PDF document text
    • http://xitemefunugege.epizy.com/cat_adoption_forms_samples.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48E 5660 bytes
SHA-256: 92a5994155326428f1c06d1b8844da8960916204d794a62a593eaf5f3729653c
font_01_sfnt_off0000d7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F3 10028 bytes
SHA-256: f2aef77db8c87934a1f06a62c1bbce663cc16d25227d8503f34705241648447d

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