Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae9b77afd4ac0ffa…

MALICIOUS

PDF

75.0 KB Created: 2021-03-22 18:29:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c5d14bb652a5c9078784eec9d63d3a09 SHA-1: 279f1746d44a5bd5f5a5c348f2306f272f30b929 SHA-256: ae9b77afd4ac0ffa6bccb112799e06c35978f4bb8ef45403083b7a77b7980b53
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is part of a link farm designed to attract traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/award?keyword=va+amendatory+clause+pdf PDF link annotation
    • https://cdn.sqhk.co/tasokuxu/H54hggh/99022074334.pdfIn PDF document text
    • https://govobozof.weebly.com/uploads/1/3/5/3/135315692/laloju_kunizutefirud_gudijagobegox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377115/normal_604d2c7c69ea2.pdfIn PDF document text
    • https://puzaloraren.weebly.com/uploads/1/3/4/5/134510283/gedutanuju-mubufiguzo-zivoke-zutigapabol.pdfIn PDF document text
    • http://wasegulom.mygamesonline.org/how_to_write_critical_thinking_skills_in_resume.pdfIn PDF document text
    • http://bobixina.getenjoyment.net/cardiopatias_congenitas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501193/normal_60357e6ae9d41.pdfIn PDF document text
    • http://katipef.medianewsonline.com/zesimuvejekedoloz.pdfIn PDF document text
    • https://sozawozoxo.weebly.com/uploads/1/3/4/5/134509422/1ddeee.pdfIn PDF document text
    • http://lebofawudire.mygamesonline.org/jopazib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369922/normal_600f83270d8aa.pdfIn PDF document text
    • https://cdn.sqhk.co/kisasizaro/QGb1uia/new_vortex_ball_rolling_uphill.pdfIn PDF document text
    • http://xirijapip.mypressonline.com/pdf_page_splitter_ubuntu.pdfIn PDF document text
    • https://rulotukipaka.weebly.com/uploads/1/3/0/7/130776525/malokufavijulefisano.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414869/normal_5fdf682f0df1d.pdfIn PDF document text
    • https://memezuwiz.weebly.com/uploads/1/3/4/7/134702577/3868239.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tekojexabutixas.epizy.com/social_phobia_test.pdfIn PDF document text
    • http://bubalafugevale.rf.gd/76280877955.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_off0000e5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AF 5368 bytes
SHA-256: 711a85739f105cacac995d46aa77117033fa8993961c9db25b351dc4acdbfcc6
font_01_sfnt_off0000f7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EB 11116 bytes
SHA-256: dff151046f5ef4f84fc15d07bcf36dc1a411ccc6e9a37398e58582311a18381a

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