Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36e3bfd6645b7be…

MALICIOUS

PDF

78.7 KB Created: 2021-04-05 13:39:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 12f3a33c6abf7561b0921cdff1384f4c SHA-1: 66f184d7425846988f9e14c09f051ed257190e4c SHA-256: c36e3bfd6645b7bedfb6e1f6911e42a286910da5a7b83338904a34570888eaec
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. The heuristic firings suggest it functions as a link farm, directing users to numerous external URLs, one of which is `https://botokaw.ru/strik?utm_term=what+does+dusk+to+dawn+photocell+mean`. The document body, though heavily obfuscated, contains text related to the URL's query parameter, reinforcing the lure. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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/strik?utm_term=what+does+dusk+to+dawn+photocell+mean PDF link annotation
    • https://kevefizi.weebly.com/uploads/1/3/1/8/131871405/valobabavobereb-bibepixud.pdfIn PDF document text
    • https://xifemobagot.weebly.com/uploads/1/3/4/0/134000541/veseruve_vinenopikoxov_vuwexon.pdfIn PDF document text
    • https://gikotaduxig.weebly.com/uploads/1/3/1/4/131454052/besubawefe_tozomojufitiru_mufapubenukep_xaxazovaki.pdfIn PDF document text
    • http://tazijiga.22web.org/89754597887.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_605f50b4e7465.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479684/normal_5fdbfa60f331c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473415/normal_6061af9e9d3f3.pdfIn PDF document text
    • https://xuxixoxeniti.weebly.com/uploads/1/3/4/5/134585484/dajinen-rabazevugodevo-dujovulivubofa-vufimoxe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0ea1ff7f-05b3-43a2-9744-178351a05ed1.filesusr.com/ugd/01f9b9_8e24c7f368be4263afa91fd6f0ce6ed9.pdf?index=trueIn PDF document text
    • https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_f6202055cdff4a86b2f9a87174523e7c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/potamotaz/do_dryer_sheets_prevent_mice.pdfIn PDF document text
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_427e1f426cad45fe9565030678339783.pdf?index=trueIn PDF document text
    • http://fexajorijoworas.epizy.com/66860440694.pdfIn PDF document text
    • http://sijozorugepidu.epizy.com/faringoamigdalitis_bacteriana_adultos.pdfIn PDF document text
    • http://lisotabisalak.epizy.com/luxurious_bedding_sheets.pdfIn PDF document text
    • http://firuwasuwubo.epizy.com/nc_used_car_bill_of_sale.pdfIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_72df31eac5b2406fba23bd5e1af66f86.pdf?index=trueIn PDF document text
    • http://tubaduk.epizy.com/70347305499.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/facebook_video_er_app_without_login.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_off0000f76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76A 5388 bytes
SHA-256: 7f73d22db1c3134a602598de05cd8efd2c0e6311a19711bbb7ff8590f45942bf
font_01_sfnt_off000109b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B1 10396 bytes
SHA-256: 6eea2bb41dac911b518d07d9cebd64f7a79f87f7e2a5c9a7125958105879c9b3