Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9e96b64d37f2b22…

MALICIOUS

PDF

82.7 KB Created: 2021-05-08 18:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01b67665ddf0779cea6b611bf92f1c00 SHA-1: 7b1487525e39975e3793c86dd333b860d6155e05 SHA-256: d9e96b64d37f2b228e907b8fbaf739df70600aa7481ff0cb047f3cf228245dfc
186 Risk Score

Malware Insights

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

This PDF file was detected 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 designed to redirect users to potentially harmful sites. The document body, though heavily obfuscated, appears to contain product-related keywords, likely serving as a lure to disguise the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jumiwimov.ru/strik?utm_term=samsung+c24f390+24-inch+curved+led+monitor+refresh+rate
    • https://laziboxejebemu.weebly.com/uploads/1/3/0/7/130740401/dujuv.pdf
    • http://nozekem.iblogger.org/the_cask_of_amontillado_espaol.pdf
    • https://cdn.sqhk.co/rufebumu/jfhf6oG/11744494093.pdf
    • https://cdn.sqhk.co/bubuzibiv/j3RjbeC/77050036482.pdf
    • http://fimobuzenetotij.iblogger.org/bed_sore_stages.pdf
    • http://xozowilozoga.mywebcommunity.org/how_to_charge_a_polaroid_portable_karaoke_speaker.pdf
    • https://sufusazowuk.weebly.com/uploads/1/3/4/3/134311692/4185845.pdf
    • https://cdn.sqhk.co/lekifuwixal/sjbjNtN/49472228449.pdf
    • https://lozuninusagutog.weebly.com/uploads/1/3/5/3/135309735/bidesotalug-tuvif-lavesizekax.pdf
    • https://cdn.sqhk.co/kufomopinu/aHjfhhE/becoming_a_substitute_teacher_in_texas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://molodoku.rf.gd/vakaxawogiberemujukipesu.pdf
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_fc5d5d9dd27e47e0ae85135fcde337fd.pdf?index=true
    • https://e8677ced-6330-435e-8237-200fb10408a4.filesusr.com/ugd/a4c1fa_b01348253cd149639ea692d85cdf478d.pdf?index=true
    • http://vagenudutuxa.rf.gd/29922657187.pdf
    • http://zowipazivavi.epizy.com/gastrointestinal_disorders.pdf
    • https://a49a6154-edc8-4132-95a2-c7bb8d673fe9.filesusr.com/ugd/551169_8b4450cdf44b4a538de1d667f8ab9ae2.pdf?index=true
    • http://gegilifopom.myartsonline.com/fluke_intellitone_pro_200_price.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f375.bin
f8474ac20737f90504d6af1164aa4148f0e0e906e4e3f3f580bedfc6990dfc74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF375 6196 bytes
font_01_sfnt_off0001085c.bin
b1717aa5edd0d57d8a357df7d7c56580d5bdebf7c647e76bc3f610d51463dfe1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1085C 11468 bytes
font_02_sfnt_off00012f46.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F46 4324 bytes

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