Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56db0c4adfec4a5…

MALICIOUS

PDF

76.7 KB Created: 2021-05-13 08:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b169920c0972dfc8f57e5d82adae09c9 SHA-1: 7984392cdb391e1059d1124369afc13de7f92b14 SHA-256: c56db0c4adfec4a590183774d485802aadf8da755c03522a433032e358f788c1
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The embedded URLs and the overall structure point towards a phishing or SEO spam campaign.

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://dafemum.ru/strik?utm_term=panelview+plus+1000+firmware+compatibility
    • https://nalepigetor.weebly.com/uploads/1/3/0/9/130968958/duwilojise_wesip_letovuteluxuj.pdf
    • https://lekipavovat.weebly.com/uploads/1/3/4/3/134332936/xefudedititel-gakoreb.pdf
    • https://sarofosifuzatu.weebly.com/uploads/1/3/5/3/135329924/63197dc7ccb1a78.pdf
    • https://cdn.sqhk.co/kizusuvut/NLvvggf/55697371811.pdf
    • https://pobipumobixox.weebly.com/uploads/1/3/1/0/131070364/7eb066a00.pdf
    • https://jukorupojos.weebly.com/uploads/1/3/5/3/135344641/jobosovuzidonon-rotenevize-nitibuvemoweran.pdf
    • https://cdn.sqhk.co/ratevusur/jfXtv45/should_i_answer_app_review.pdf
    • https://dutosagow.weebly.com/uploads/1/3/0/7/130775111/bd00d873db608af.pdf
    • https://leruvipox.weebly.com/uploads/1/3/5/3/135347136/feketaxotupifibajum.pdf
    • https://bipixexomalexu.weebly.com/uploads/1/3/4/3/134349320/nimeperetolevabukepe.pdf
    • https://cdn.sqhk.co/mutexeze/jbYjegi/rorivabisikal.pdf
    • http://igcopyrightclient.com/49709275036729vx.pdf
    • http://futup.ru/how_to_use_jam_bluetooth_speaker7dihu.pdf
    • https://xaweworamek.weebly.com/uploads/1/3/4/6/134610398/07d6e8c0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_10bb4f2efedf4a559a24b4260d937ea0.pdf?index=true
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_4f93d4a6c12a480486d55e0d7a8e3894.pdf?index=true
    • https://770603ce-cae8-48b7-b4e8-6e15b9dac1cd.filesusr.com/ugd/e975af_afac6948a1fa4093be62272e52acdc3e.pdf?index=true
    • https://ba5d4ca7-777b-4ff7-855d-60fc8da7b8b2.filesusr.com/ugd/29a726_b8d38c4fae3c46f7bd238b84809e5326.pdf?index=true
    • https://a19d597f-2220-41b3-9459-688249e8a20b.filesusr.com/ugd/f19f53_7e9e0a2dde3c43f896854fe5906bfb2c.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_off0000edd6.bin
a9b7aa888cd8e03f2206d32b982ec95d0b624d8c9e6b2f95adda506367a8d656		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD6 5752 bytes
font_01_sfnt_off0001016d.bin
8797efcb6fa8e817a112b9aef53ea67d183142a9ac87520bf7a6a1163fe0762f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1016D 10588 bytes

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