Malicious PDF — malware analysis report

Static analysis result for SHA-256 e477afe7c7deaff2…

MALICIOUS

PDF

95.3 KB Created: 2021-03-05 18:21:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7283e561fae75d0f8242cbd3936a7f9 SHA-1: dd52354e343cd22eb60a1602e1c8719fe8f0e36c SHA-256: e477afe7c7deaff2c0eae89387c81e550c08048755a901a573d357b7145afe6a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_SEO_LINK_FARM heuristic specifically identifying a mass of external links. The embedded URLs suggest an attempt to redirect users to potentially malicious or unwanted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://botokaw.ru/aws?utm_term=what+is+auld+lang+syne+stand+for
    • https://sagerogokijisoj.weebly.com/uploads/1/3/4/6/134601402/kidunimafudo_noliledex.pdf
    • https://wesaxewotivaf.weebly.com/uploads/1/3/4/5/134578523/4622315.pdf
    • https://gezifizisosuvul.weebly.com/uploads/1/3/6/0/136050083/diwagoveji.pdf
    • https://cdn.sqhk.co/pulovafafita/jjJsDih/skin_editor_for_minecraft_windows_10.pdf
    • http://neriwor.medianewsonline.com/what_do_you_need_to_pass_the_naplex.pdf
    • https://mitivowa.weebly.com/uploads/1/3/1/6/131607237/sasixalume.pdf
    • https://static.s123-cdn-static.com/uploads/4374843/normal_5fca378ea599b.pdf
    • https://fitisasituwag.weebly.com/uploads/1/3/4/8/134846324/poxudan-xaruwegax-vudumukaw-kajipopeb.pdf
    • https://jasefukop.weebly.com/uploads/1/3/0/7/130776564/df2db9a245.pdf
    • https://static.s123-cdn-static.com/uploads/4380700/normal_5fcf1f9d2246e.pdf
    • https://lababober.weebly.com/uploads/1/3/5/3/135329518/4591039.pdf
    • https://repitosa.weebly.com/uploads/1/3/2/6/132681506/2c8479354cae.pdf
    • http://lorakuze.sportsontheweb.net/nudozezog.pdf
    • https://debesawoxud.weebly.com/uploads/1/3/0/7/130775383/magaxotu-wimodolagov.pdf
    • http://wodekenizowa.getenjoyment.net/troy-bilt_9_in._140cc_gas_lawn_edger_trencher_25b-55ma766.pdf
    • https://zimuvudiredefux.weebly.com/uploads/1/3/2/7/132710782/d53a4053946.pdf
    • https://cdn.sqhk.co/xikesurufa/ww6jhhh/bubble_shooter_panda_game.pdf
    • https://static.s123-cdn-static.com/uploads/4477651/normal_60048dbe9ef7b.pdf
    • http://nowukusox.mypressonline.com/massey_ferguson_3545_decals.pdf
    • https://cdn.sqhk.co/bexikerez/jjcPhfx/xeradino.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vobogiv.rf.gd/92397772281.pdf
    • http://sofibimibojas.myartsonline.com/56265180505.pdf
    • http://vamivesuger.epizy.com/how_to_report_errors_on_google_maps.pdf
    • http://sijaxulo.rf.gd/44214524557.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_off000123cd.bin
e853f89ca3a2f6183aab9ebaee38558a2b547d539506ede759404a9723489a8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123CD 3664 bytes
font_01_sfnt_off000130eb.bin
d6ae96b2befdf3eccf47a171488e2612271b2a0d26b83b8c2e4329b44ea04523		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130EB 5284 bytes
font_02_sfnt_off000142f1.bin
38dea51ccf450b3e090644882f702d775bf85b079d2b1873a6156bd74a0e3214		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142F1 13956 bytes

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