Malicious PDF — malware analysis report

Static analysis result for SHA-256 21faba99ac5e3e73…

MALICIOUS

PDF

73.9 KB Created: 2021-05-03 04:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23662763a2e1ef739b474d134ab0e2ab SHA-1: d79b1f6df94568a1fc012bde1e7c91b3b0e3a452 SHA-256: 21faba99ac5e3e732e01487a2f80bcc6f5b6e0866eef623e67cb403c20cd5cd2
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the presence of numerous URLs and the 'PDF_SEO_LINK_FARM' heuristic point towards an attack pattern focused on redirecting users to potentially malicious content.

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://xezojetit.ru/strik?utm_term=how+to+open+lg+flip+phone
    • https://zokuvulasaxibu.weebly.com/uploads/1/3/5/2/135298812/b6ae5521de2124d.pdf
    • https://dewufore.weebly.com/uploads/1/3/4/8/134857007/lifexobedajerapetadu.pdf
    • http://hotita.space/sheffield_children_s_hospital_emergency_department_guidelinesxbjq5.pdf
    • http://trixy-matrix.space/52328934816g23c6.pdf
    • http://artistichomesolutions.com/79653561129tc2ie.pdf
    • http://alkostore.xyz/what_is_the_directory_in_the_french_revolution663ly.pdf
    • http://velokir.22web.org/how_do_you_add_apps_to_dish_network.pdf
    • http://pay-order.info/bizhub_c224e_firmwarew3fl7.pdf
    • https://raguloduw.weebly.com/uploads/1/3/4/0/134041620/zaged.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9e2901ea-5d25-41a5-867c-54d0774c6e48.filesusr.com/ugd/4d0f37_a372a55bc03849f1a1c072cb4fc62ee2.pdf?index=true
    • http://gifixutazopoja.epizy.com/autobus_marbella_malaga.pdf
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_2e9cd806a8694abc80f458c79655b257.pdf?index=true
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_4bac850c49d546c6b969bdaf236e8704.pdf?index=true
    • http://xitutudatiri.epizy.com/ullathai_allitha_padam.pdf
    • https://f621ecf8-e26c-4db3-9bdf-176eeceb312d.filesusr.com/ugd/b3755e_891f6ce7237945de909f93e129568df4.pdf?index=true
    • http://lavodusepigixu.rf.gd/17057590379.pdf
    • https://8d537faf-e869-4ed9-a29f-988560fab1dc.filesusr.com/ugd/0cce51_a01dac35bae940f59ddfbac0e82e2e17.pdf?index=true
    • http://vudexejuvejutek.rf.gd/best_stock_app_2020_reddit.pdf
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_65bccda8927549ce9093edf6974ab492.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e54c.bin
a4a0171be14aadd57773b96207cfd64c5444e389f82d272acab96437585ca538		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE54C 4732 bytes
font_01_sfnt_off0000f584.bin
4655912d1cbcabe90d0b6be893e07d59ce886d5a7c3e0b2af0d77ce9186ab526		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF584 10912 bytes

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